diff --git a/src/crypto/gui/signencryptfileswizard.cpp b/src/crypto/gui/signencryptfileswizard.cpp
index 14cc9600b..6c8b5fe37 100644
--- a/src/crypto/gui/signencryptfileswizard.cpp
+++ b/src/crypto/gui/signencryptfileswizard.cpp
@@ -1,600 +1,608 @@
 /*  crypto/gui/signencryptfileswizard.cpp
 
     This file is part of Kleopatra, the KDE keymanager
     SPDX-FileCopyrightText: 2009 Klarälvdalens Datakonsult AB
 
     SPDX-FileCopyrightText: 2016 Bundesamt für Sicherheit in der Informationstechnik
     SPDX-FileContributor: Intevation GmbH
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include <config-kleopatra.h>
 
 #include "signencryptfileswizard.h"
 #include "signencryptwidget.h"
 
 #include "newresultpage.h"
 
 #include <KLocalizedString>
 #include <KSharedConfig>
 #include <KColorScheme>
 #include <KConfigGroup>
 #include <KWindowConfig>
 
 #include <KMessageBox>
 
 #include "kleopatra_debug.h"
 #include <Libkleo/GnuPG>
 #include <Libkleo/Formatting>
 
 #include <Libkleo/FileNameRequester>
 #include <QWindow>
 #include <QVBoxLayout>
 #include <QWizardPage>
 #include <QGroupBox>
 #include <QLabel>
 #include <QIcon>
 #include <QCheckBox>
 
 
 #include <gpgme++/key.h>
 
 
 using namespace GpgME;
 using namespace Kleo;
 using namespace Kleo::Crypto::Gui;
 
 enum Page {
     SigEncPageId,
     ResultPageId,
 
     NumPages
 };
 
 class FileNameRequesterWithIcon : public QWidget
 {
     Q_OBJECT
 
 public:
     explicit FileNameRequesterWithIcon(QDir::Filters filter, QWidget *parent = nullptr)
         : QWidget(parent)
     {
         auto layout = new QHBoxLayout{this};
         layout->setContentsMargins(0, 0, 0, 0);
         mIconLabel = new QLabel{this};
         mRequester = new FileNameRequester{filter, this};
         mRequester->setExistingOnly(false);
         layout->addWidget(mIconLabel);
         layout->addWidget(mRequester);
 
         setFocusPolicy(mRequester->focusPolicy());
         setFocusProxy(mRequester);
 
         connect(mRequester, &FileNameRequester::fileNameChanged,
                 this, &FileNameRequesterWithIcon::fileNameChanged);
     }
 
     void setIcon(const QIcon &icon)
     {
         mIconLabel->setPixmap(icon.pixmap(32, 32));
     }
 
     void setFileName(const QString &name)
     {
         mRequester->setFileName(name);
     }
 
     QString fileName() const
     {
         return mRequester->fileName();
     }
 
 Q_SIGNALS:
     void fileNameChanged(const QString &filename);
 
 protected:
     bool event(QEvent *e) override
     {
         if (e->type() == QEvent::ToolTipChange) {
             mRequester->setToolTip(toolTip());
         }
         return QWidget::event(e);
     }
 
 private:
     QLabel *mIconLabel;
     FileNameRequester *mRequester;
 };
 
 class SigEncPage: public QWizardPage
 {
     Q_OBJECT
 
 public:
     explicit SigEncPage(QWidget *parent = nullptr)
         : QWizardPage(parent),
           mParent((SignEncryptFilesWizard *) parent),
           mWidget(new SignEncryptWidget),
           mOutLayout(new QVBoxLayout),
           mOutputLabel{nullptr},
           mArchive(false),
           mUseOutputDir(false),
           mSingleFile{true}
     {
         setTitle(i18nc("@title", "Sign / Encrypt Files"));
         auto vLay = new QVBoxLayout(this);
         vLay->setContentsMargins(0, 0, 0, 0);
         mWidget->setSignAsText(i18nc("@option:check on SignEncryptPage",
                                      "&Sign as:"));
         mWidget->setEncryptForMeText(i18nc("@option:check on SignEncryptPage",
                                            "Encrypt for &me:"));
         mWidget->setEncryptForOthersText(i18nc("@option:check on SignEncryptPage",
                                                "Encrypt for &others:"));
         mWidget->setEncryptWithPasswordText(i18nc("@option:check on SignEncryptPage",
                                                   "Encrypt with &password. Anyone you share the password with can read the data."));
         vLay->addWidget(mWidget);
         connect(mWidget, &SignEncryptWidget::operationChanged, this,
                 &SigEncPage::updateCommitButton);
         connect(mWidget, &SignEncryptWidget::keysChanged, this,
                 &SigEncPage::updateFileWidgets);
 
         auto outputGrp = new QGroupBox(i18nc("@title:group", "Output"));
         outputGrp->setLayout(mOutLayout);
 
         mPlaceholderWidget = new QLabel(i18n("Please select an action."));
         mOutLayout->addWidget(mPlaceholderWidget);
 
         mOutputLabel = new QLabel(i18nc("@label on SignEncryptPage", "Output &files/folder:"));
         mOutLayout->addWidget(mOutputLabel);
 
         createRequesters(mOutLayout);
 
         mUseOutputDirChk = new QCheckBox(i18nc("@option:check on SignEncryptPage",
                                                "Encrypt / Sign &each file separately."));
         mUseOutputDirChk->setToolTip(i18nc("@info:tooltip",
                                            "Keep each file separate instead of creating an archive for all."));
         mOutLayout->addWidget(mUseOutputDirChk);
         connect (mUseOutputDirChk, &QCheckBox::toggled, this, [this] (bool state) {
                     mUseOutputDir = state;
                     mArchive = !mUseOutputDir && !mSingleFile;
                     updateFileWidgets();
                 });
 
         vLay->addWidget(outputGrp);
 
         setMinimumHeight(300);
     }
 
     void setEncryptionPreset(bool value)
     {
         mWidget->setEncryptionChecked(value);
     }
 
     void setSigningPreset(bool value)
     {
         mWidget->setSigningChecked(value);
     }
 
     bool isComplete() const override
     {
         return !mWidget->currentOp().isNull();
     }
 
     int nextId() const override
     {
         return ResultPageId;
     }
 
     void initializePage() override
     {
         setCommitPage(true);
         updateCommitButton(mWidget->currentOp());
     }
 
     void setArchiveForced(bool archive)
     {
         mArchive = archive;
         setArchiveMutable(!archive);
     }
 
     void setArchiveMutable(bool archive)
     {
         mUseOutputDirChk->setVisible(archive);
         if (archive) {
             const KConfigGroup archCfg(KSharedConfig::openConfig(), "SignEncryptFilesWizard");
             mUseOutputDirChk->setChecked(archCfg.readEntry("LastUseOutputDir", false));
         } else {
             mUseOutputDirChk->setChecked(false);
         }
     }
 
     void setSingleFile(bool singleFile)
     {
         mSingleFile = singleFile;
         mArchive = !mUseOutputDir && !mSingleFile;
     }
 
     bool validatePage() override
     {
+        if (Kleo::gnupgUsesDeVsCompliance() && !Kleo::gnupgIsDeVsCompliant()) {
+            KMessageBox::sorry(topLevelWidget(),
+                               xi18nc("@info %1 is a placeholder for the name of a compliance mode. E.g. NATO RESTRICTED compliant or VS-NfD compliant",
+                                      "<para>Sorry! You cannot use Kleopatra for signing or encrypting files "
+                                      "because the <application>GnuPG</application> system used by Kleopatra is not %1.</para>",
+                                      Formatting::deVsString()));
+            return false;
+        }
         bool sign = !mWidget->signKey().isNull();
         bool encrypt = !mWidget->selfKey().isNull() || !mWidget->recipients().empty();
         if (!mWidget->validate()) {
             return false;
         }
         mWidget->saveOwnKeys();
         if (mUseOutputDirChk->isVisible()) {
             KConfigGroup archCfg(KSharedConfig::openConfig(), "SignEncryptFilesWizard");
             archCfg.writeEntry("LastUseOutputDir", mUseOutputDir);
         }
 
         if (sign && !encrypt && mArchive) {
             return KMessageBox::warningContinueCancel(this,
             xi18nc("@info",
             "<para>Archiving in combination with sign-only currently requires what are known as opaque signatures - "
             "unlike detached ones, these embed the content in the signature.</para>"
             "<para>This format is rather unusual. You might want to archive the files separately, "
             "and then sign the archive as one file with Kleopatra.</para>"
             "<para>Future versions of Kleopatra are expected to also support detached signatures in this case.</para>"),
             i18nc("@title:window", "Unusual Signature Warning"),
             KStandardGuiItem::cont(), KStandardGuiItem::cancel(),
             QStringLiteral("signencryptfileswizard-archive+sign-only-warning"))
             == KMessageBox::Continue;
         } else if (sign && !encrypt) {
             return true;
         }
 
         if (!mWidget->selfKey().isNull() || mWidget->encryptSymmetric()) {
             return true;
         }
         const auto recipientKeys = recipients();
         const bool hasSecret = std::any_of(std::begin(recipientKeys), std::end(recipientKeys),
                                            [](const auto &k) { return k.hasSecret(); });
         if (!hasSecret) {
             if (KMessageBox::warningContinueCancel(this,
             xi18nc("@info",
             "<para>None of the recipients you are encrypting to seems to be your own.</para>"
             "<para>This means that you will not be able to decrypt the data anymore, once encrypted.</para>"
             "<para>Do you want to continue, or cancel to change the recipient selection?</para>"),
             i18nc("@title:window", "Encrypt-To-Self Warning"),
             KStandardGuiItem::cont(),
             KStandardGuiItem::cancel(),
             QStringLiteral("warn-encrypt-to-non-self"), KMessageBox::Notify | KMessageBox::Dangerous)
             == KMessageBox::Cancel) {
                 return false;
             }
         }
         return true;
     }
 
     std::vector<Key> recipients() const
     {
         return mWidget->recipients();
     }
 
     /* In the future we might find a usecase for multiple
      * signers */
     std::vector<Key> signers() const
     {
         const Key k = mWidget->signKey();
         if (!k.isNull()) {
             return {k};
         }
         return {};
     }
 
 private:
     void createRequesters(QBoxLayout *lay) {
         static const QMap <int, QString> icons = {
             { SignEncryptFilesWizard::SignatureCMS, QStringLiteral("document-sign") },
             { SignEncryptFilesWizard::SignaturePGP, QStringLiteral("document-sign") },
             { SignEncryptFilesWizard::CombinedPGP,  QStringLiteral("document-edit-sign-encrypt") },
             { SignEncryptFilesWizard::EncryptedPGP, QStringLiteral("document-encrypt") },
             { SignEncryptFilesWizard::EncryptedCMS, QStringLiteral("document-encrypt") },
             { SignEncryptFilesWizard::Directory,    QStringLiteral("folder") }
         };
         static const QMap <int, QString> toolTips = {
             { SignEncryptFilesWizard::SignatureCMS, i18n("The S/MIME signature.") },
             { SignEncryptFilesWizard::SignaturePGP, i18n("The signature.") },
             { SignEncryptFilesWizard::CombinedPGP,  i18n("The signed and encrypted file.") },
             { SignEncryptFilesWizard::EncryptedPGP, i18n("The encrypted file.") },
             { SignEncryptFilesWizard::EncryptedCMS, i18n("The S/MIME encrypted file.") },
             { SignEncryptFilesWizard::Directory,    i18n("Output directory.") }
         };
 
         if (!mRequesters.empty()) {
             return;
         }
         for (auto kind : icons.keys()) {
             auto requesterWithIcon = new FileNameRequesterWithIcon{
                 kind == SignEncryptFilesWizard::Directory ? QDir::Dirs : QDir::Files, this};
             requesterWithIcon->setIcon(QIcon::fromTheme(icons[kind]));
             requesterWithIcon->setToolTip(toolTips[kind]);
             lay->addWidget(requesterWithIcon);
 
             connect(requesterWithIcon, &FileNameRequesterWithIcon::fileNameChanged, this,
                     [this, kind](const QString &newName) {
                         mOutNames[kind] = newName;
                     });
 
             mRequesters.insert(kind, requesterWithIcon);
         }
     }
 
 public:
     void setOutputNames(const QMap<int, QString> &names) {
         Q_ASSERT(mOutNames.isEmpty());
         for (auto it = std::begin(names); it != std::end(names); ++it) {
             mRequesters.value(it.key())->setFileName(it.value());
         }
         mOutNames = names;
         updateFileWidgets();
     }
 
     QMap <int, QString> outputNames() const {
         if (!mUseOutputDir) {
             auto ret = mOutNames;
             ret.remove(SignEncryptFilesWizard::Directory);
             return ret;
         }
         return mOutNames;
     }
 
     bool encryptSymmetric() const
     {
         return mWidget->encryptSymmetric();
     }
 
 private Q_SLOTS:
     void updateCommitButton(const QString &label)
     {
         if (mParent->currentPage() != this) {
             return;
         }
         auto btn = mParent->button(QWizard::CommitButton);
         if (!label.isEmpty()) {
             mParent->setButtonText(QWizard::CommitButton, label);
             if (Kleo::gnupgUsesDeVsCompliance()) {
                 const bool de_vs = Kleo::gnupgIsDeVsCompliant() && mWidget->isDeVsAndValid();
                 btn->setIcon(QIcon::fromTheme(de_vs
                                              ? QStringLiteral("security-high")
                                              : QStringLiteral("security-medium")));
                 btn->setStyleSheet(QStringLiteral("background-color: ") + (de_vs
                                    ? KColorScheme(QPalette::Active, KColorScheme::View).background(KColorScheme::PositiveBackground).color().name()
                                    : KColorScheme(QPalette::Active, KColorScheme::View).background(KColorScheme::NegativeBackground).color().name()));
                 mParent->setLabelText(de_vs
                         ? i18nc("%1 is a placeholder for the name of a compliance mode. E.g. NATO RESTRICTED compliant or VS-NfD compliant",
                             "%1 communication possible.", Formatting::deVsString())
                         : i18nc("%1 is a placeholder for the name of a compliance mode. E.g. NATO RESTRICTED compliant or VS-NfD compliant",
                             "%1 communication not possible.", Formatting::deVsString()));
             }
         } else {
             mParent->setButtonText(QWizard::CommitButton, i18n("Next"));
             btn->setIcon(QIcon());
             btn->setStyleSheet(QString());
         }
         Q_EMIT completeChanged();
     }
 
     void updateFileWidgets()
     {
         if (mRequesters.isEmpty()) {
             return;
         }
         const std::vector<Key> recipients = mWidget->recipients();
         const Key sigKey = mWidget->signKey();
         const bool pgp = mWidget->encryptSymmetric() ||
                          std::any_of(std::cbegin(recipients), std::cend(recipients),
                                      [](const auto &k) { return k.protocol() == Protocol::OpenPGP; });
         const bool cms = std::any_of(std::cbegin(recipients), std::cend(recipients),
                                      [](const auto &k) { return k.protocol() == Protocol::CMS; });
 
         mOutLayout->setEnabled(false);
         if (cms || pgp || !sigKey.isNull()) {
             mPlaceholderWidget->setVisible(false);
             mOutputLabel->setVisible(true);
             mRequesters[SignEncryptFilesWizard::SignatureCMS]->setVisible(!mUseOutputDir && sigKey.protocol() == Protocol::CMS);
             mRequesters[SignEncryptFilesWizard::EncryptedCMS]->setVisible(!mUseOutputDir && cms);
             mRequesters[SignEncryptFilesWizard::CombinedPGP]->setVisible(!mUseOutputDir && sigKey.protocol() == Protocol::OpenPGP && pgp);
             mRequesters[SignEncryptFilesWizard::EncryptedPGP]->setVisible(!mUseOutputDir && sigKey.protocol() != Protocol::OpenPGP && pgp);
             mRequesters[SignEncryptFilesWizard::SignaturePGP]->setVisible(!mUseOutputDir && sigKey.protocol() == Protocol::OpenPGP && !pgp);
             mRequesters[SignEncryptFilesWizard::Directory]->setVisible(mUseOutputDir);
             auto firstNotHidden = std::find_if(std::cbegin(mRequesters), std::cend(mRequesters),
                                                [](auto w) { return !w->isHidden(); });
             mOutputLabel->setBuddy(*firstNotHidden);
         } else {
             mPlaceholderWidget->setVisible(true);
             mOutputLabel->setVisible(false);
             std::for_each(std::cbegin(mRequesters), std::cend(mRequesters),
                           [](auto w) { w->setVisible(false); });
             mOutputLabel->setBuddy(nullptr);
         }
         mOutLayout->setEnabled(true);
     }
 
 private:
     SignEncryptFilesWizard *mParent;
     SignEncryptWidget *mWidget;
     QMap <int, QString> mOutNames;
     QMap <int, FileNameRequesterWithIcon *> mRequesters;
     QVBoxLayout *mOutLayout;
     QWidget *mPlaceholderWidget;
     QCheckBox *mUseOutputDirChk;
     QLabel *mOutputLabel;
     bool mArchive;
     bool mUseOutputDir;
     bool mSingleFile;
 };
 
 class ResultPage : public NewResultPage
 {
     Q_OBJECT
 
 public:
     explicit ResultPage(QWidget *parent = nullptr)
         : NewResultPage(parent),
           mParent((SignEncryptFilesWizard *) parent)
     {
         setTitle(i18nc("@title", "Results"));
         setSubTitle(i18nc("@title",
                           "Status and progress of the crypto operations is shown here."));
     }
 
     void initializePage() override
     {
         mParent->setLabelText(QString());
     }
 
 private:
     SignEncryptFilesWizard *mParent;
 };
 
 SignEncryptFilesWizard::SignEncryptFilesWizard(QWidget *parent, Qt::WindowFlags f)
     : QWizard(parent, f)
 {
     readConfig();
 
     const bool de_vs = Kleo::gnupgUsesDeVsCompliance();
 #ifdef Q_OS_WIN
     // Enforce modern style to avoid vista style ugliness.
     setWizardStyle(QWizard::ModernStyle);
 #endif
     mSigEncPage = new SigEncPage(this);
     mResultPage = new ResultPage(this);
 
     connect(this, &QWizard::currentIdChanged, this,
             &SignEncryptFilesWizard::slotCurrentIdChanged);
     setPage(SigEncPageId, mSigEncPage);
     setPage(ResultPageId, mResultPage);
     setOptions(QWizard::IndependentPages |
                (de_vs ? QWizard::HaveCustomButton1 : QWizard::WizardOption(0)) |
                QWizard::NoBackButtonOnLastPage |
                QWizard::NoBackButtonOnStartPage);
 
     if (de_vs) {
         /* We use a custom button to display a label next to the
            buttons.  */
         auto btn = button(QWizard::CustomButton1);
         /* We style the button so that it looks and acts like a
            label.  */
         btn->setStyleSheet(QStringLiteral("border: none"));
         btn->setFocusPolicy(Qt::NoFocus);
     }
 }
 
 void SignEncryptFilesWizard::setLabelText(const QString &label)
 {
     button(QWizard::CommitButton)->setToolTip(label);
     setButtonText(QWizard::CustomButton1, label);
 }
 
 void SignEncryptFilesWizard::slotCurrentIdChanged(int id)
 {
     if (id == ResultPageId) {
         Q_EMIT operationPrepared();
     }
 }
 
 SignEncryptFilesWizard::~SignEncryptFilesWizard()
 {
     qCDebug(KLEOPATRA_LOG);
     writeConfig();
 }
 
 void SignEncryptFilesWizard::setSigningPreset(bool preset)
 {
     mSigEncPage->setSigningPreset(preset);
 }
 
 void SignEncryptFilesWizard::setSigningUserMutable(bool mut)
 {
     if (mut == mSigningUserMutable) {
         return;
     }
     mSigningUserMutable = mut;
 }
 
 void SignEncryptFilesWizard::setEncryptionPreset(bool preset)
 {
     mSigEncPage->setEncryptionPreset(preset);
 }
 
 void SignEncryptFilesWizard::setEncryptionUserMutable(bool mut)
 {
     if (mut == mEncryptionUserMutable) {
         return;
     }
     mEncryptionUserMutable = mut;
 }
 
 void SignEncryptFilesWizard::setArchiveForced(bool archive)
 {
     mSigEncPage->setArchiveForced(archive);
 }
 
 void SignEncryptFilesWizard::setArchiveMutable(bool archive)
 {
     mSigEncPage->setArchiveMutable(archive);
 }
 
 void SignEncryptFilesWizard::setSingleFile(bool singleFile)
 {
     mSigEncPage->setSingleFile(singleFile);
 }
 
 std::vector<Key> SignEncryptFilesWizard::resolvedRecipients() const
 {
     return mSigEncPage->recipients();
 }
 
 std::vector<Key> SignEncryptFilesWizard::resolvedSigners() const
 {
     return mSigEncPage->signers();
 }
 
 void SignEncryptFilesWizard::setTaskCollection(const std::shared_ptr<Kleo::Crypto::TaskCollection> &coll)
 {
     mResultPage->setTaskCollection(coll);
 }
 
 void SignEncryptFilesWizard::setOutputNames(const QMap<int, QString> &map) const
 {
     mSigEncPage->setOutputNames(map);
 }
 
 QMap<int, QString> SignEncryptFilesWizard::outputNames() const
 {
     return mSigEncPage->outputNames();
 }
 
 bool SignEncryptFilesWizard::encryptSymmetric() const
 {
     return mSigEncPage->encryptSymmetric();
 }
 
 void SignEncryptFilesWizard::readConfig()
 {
     winId(); // ensure there's a window created
 
     // set default window size
     windowHandle()->resize(640, 480);
 
     // restore size from config file
     KConfigGroup cfgGroup(KSharedConfig::openConfig(), "SignEncryptFilesWizard");
     KWindowConfig::restoreWindowSize(windowHandle(), cfgGroup);
 
     // NOTICE: QWindow::setGeometry() does NOT impact the backing QWidget geometry even if the platform
     // window was created -> QTBUG-40584. We therefore copy the size here.
     // TODO: remove once this was resolved in QWidget QPA
     resize(windowHandle()->size());
 }
 
 void SignEncryptFilesWizard::writeConfig()
 {
     KConfigGroup cfgGroup(KSharedConfig::openConfig(), "SignEncryptFilesWizard");
     KWindowConfig::saveWindowSize(windowHandle(), cfgGroup);
     cfgGroup.sync();
 }
 
 
 #include "signencryptfileswizard.moc"
diff --git a/src/view/padwidget.cpp b/src/view/padwidget.cpp
index 3f9a56a63..4c44bc21d 100644
--- a/src/view/padwidget.cpp
+++ b/src/view/padwidget.cpp
@@ -1,508 +1,517 @@
 /* -*- mode: c++; c-basic-offset:4 -*-
     padwidget.cpp
 
     This file is part of Kleopatra, the KDE keymanager
     SPDX-FileCopyrightText: 2018 Intevation GmbH
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "padwidget.h"
 
 #include "kleopatra_debug.h"
 
 #include <Libkleo/KleoException>
 #include <Libkleo/Classify>
 #include <Libkleo/KeyCache>
 #include <Libkleo/Formatting>
 
 #include "crypto/gui/signencryptwidget.h"
 #include "crypto/gui/resultitemwidget.h"
 
 #include "crypto/signencrypttask.h"
 #include "crypto/decryptverifytask.h"
 #include <Libkleo/GnuPG>
 #include "utils/input.h"
 #include "utils/output.h"
 
 #include "commands/importcertificatefromdatacommand.h"
 
 #include <gpgme++/data.h>
 #include <gpgme++/decryptionresult.h>
 
 #include <QGpgME/DataProvider>
 
 #include <QButtonGroup>
 #include <QFontDatabase>
 #include <QFontMetrics>
 #include <QLabel>
 #include <QProgressBar>
 #include <QPushButton>
 #include <QRadioButton>
 #include <QTabWidget>
 #include <QTextEdit>
 #include <QVBoxLayout>
 
 #include <KLocalizedString>
 #include <KColorScheme>
 #include <KMessageBox>
 
 #include <KSharedConfig>
 #include <KConfigGroup>
 
 using namespace Kleo;
 using namespace Kleo::Crypto;
 using namespace Kleo::Crypto::Gui;
 
 static GpgME::Protocol getProtocol(const std::shared_ptr<const Kleo::Crypto::Task::Result> &result)
 {
     const auto dvResult = dynamic_cast<const Kleo::Crypto::DecryptVerifyResult*>(result.get());
     if (dvResult) {
         for (const auto &key: KeyCache::instance()->findRecipients(dvResult->decryptionResult())) {
             return key.protocol();
         }
         for (const auto &key: KeyCache::instance()->findSigners(dvResult->verificationResult())) {
             return key.protocol();
         }
     }
     return GpgME::UnknownProtocol;
 }
 
 class PadWidget::Private
 {
 public:
     Private(PadWidget *qq):
         q(qq),
         mEdit(new QTextEdit),
         mCryptBtn(new QPushButton(QIcon::fromTheme(QStringLiteral("document-edit-sign-encrypt")), i18n("Sign / Encrypt Notepad"))),
         mDecryptBtn(new QPushButton(QIcon::fromTheme(QStringLiteral("document-edit-decrypt-verify")), i18n("Decrypt / Verify Notepad"))),
         mRevertBtn(new QPushButton(QIcon::fromTheme(QStringLiteral("edit-undo")), i18n("Revert"))),
         mAdditionalInfoLabel(new QLabel),
         mSigEncWidget(new SignEncryptWidget(nullptr, true)),
         mProgressBar(new QProgressBar),
         mProgressLabel(new QLabel),
         mLastResultWidget(nullptr),
         mPGPRB(nullptr),
         mCMSRB(nullptr),
         mImportProto(GpgME::UnknownProtocol)
     {
         auto vLay = new QVBoxLayout(q);
 
         auto btnLay = new QHBoxLayout;
         vLay->addLayout(btnLay);
         btnLay->addWidget(mCryptBtn);
         btnLay->addWidget(mDecryptBtn);
         btnLay->addWidget(mRevertBtn);
 
         mRevertBtn->setVisible(false);
 
         btnLay->addWidget(mAdditionalInfoLabel);
 
         btnLay->addStretch(-1);
 
         mProgressBar->setRange(0, 0);
         mProgressBar->setVisible(false);
         mProgressLabel->setVisible(false);
         auto progLay = new QHBoxLayout;
 
         progLay->addWidget(mProgressLabel);
         progLay->addWidget(mProgressBar);
 
         mStatusLay = new QVBoxLayout;
         mStatusLay->addLayout(progLay);
         vLay->addLayout(mStatusLay, 0);
 
         auto tabWidget = new QTabWidget;
         vLay->addWidget(tabWidget, 1);
 
         tabWidget->addTab(mEdit, QIcon::fromTheme(QStringLiteral("edittext")), i18n("Notepad"));
 
         // The recipients area
         auto recipientsWidget = new QWidget;
         auto recipientsVLay = new QVBoxLayout(recipientsWidget);
         auto protocolSelectionLay = new QHBoxLayout;
 
         bool pgpOnly = KeyCache::instance()->pgpOnly();
         if (!pgpOnly) {
             recipientsVLay->addLayout(protocolSelectionLay);
         }
 
         protocolSelectionLay->addWidget(new QLabel(i18n("<h3>Protocol:</h3>")));
         protocolSelectionLay->addStretch(-1);
         // Once S/MIME is supported add radio for S/MIME here.
 
         recipientsVLay->addWidget(mSigEncWidget);
         tabWidget->addTab(recipientsWidget, QIcon::fromTheme(QStringLiteral("contact-new-symbolic")),
                           i18n("Recipients"));
 
         mEdit->setPlaceholderText(i18n("Enter a message to encrypt or decrypt..."));
 
         auto fixedFont = QFont(QStringLiteral("Monospace"));
         fixedFont.setStyleHint(QFont::TypeWriter);
         // This does not work well
         // QFontDatabase::systemFont(QFontDatabase::FixedFont);
 
         mEdit->setFont(fixedFont);
         mEdit->setAcceptRichText(false);
         mEdit->setMinimumWidth(QFontMetrics(fixedFont).averageCharWidth() * 70);
 
         if (KeyCache::instance()->pgpOnly()) {
             mSigEncWidget->setProtocol(GpgME::OpenPGP);
         } else {
             auto grp = new QButtonGroup(q);
             auto mPGPRB = new QRadioButton(i18n("OpenPGP"));
             auto mCMSRB = new QRadioButton(i18n("S/MIME"));
             grp->addButton(mPGPRB);
             grp->addButton(mCMSRB);
 
             KConfigGroup config(KSharedConfig::openConfig(), "Notepad");
             if (config.readEntry("wasCMS", false)) {
                 mCMSRB->setChecked(true);
                 mSigEncWidget->setProtocol(GpgME::CMS);
             } else {
                 mPGPRB->setChecked(true);
                 mSigEncWidget->setProtocol(GpgME::OpenPGP);
             }
 
             protocolSelectionLay->addWidget(mPGPRB);
             protocolSelectionLay->addWidget(mCMSRB);
             connect(mPGPRB, &QRadioButton::toggled, q, [this] (bool value) {
                     if (value) {
                         mSigEncWidget->setProtocol(GpgME::OpenPGP);
                     }
                 });
             connect(mCMSRB, &QRadioButton::toggled, q, [this] (bool value) {
                     if (value) {
                         mSigEncWidget->setProtocol(GpgME::CMS);
                     }
                 });
         }
 
         updateCommitButton();
 
         connect(mEdit, &QTextEdit::textChanged, q, [this] () {
                 updateCommitButton();
             });
 
         connect(mCryptBtn, &QPushButton::clicked, q, [this] () {
                 if (mImportProto != GpgME::UnknownProtocol) {
                     doImport();
                 } else {
                     doEncryptSign();
                 }
             });
 
         connect(mSigEncWidget, &SignEncryptWidget::operationChanged, q, [this] (const QString &) {
                 updateCommitButton();
             });
 
         connect(mDecryptBtn, &QPushButton::clicked, q, [this] () {
                 doDecryptVerify();
             });
 
         connect(mRevertBtn, &QPushButton::clicked, q, [this] () {
                 revert();
             });
     }
 
     void revert()
     {
         mEdit->setPlainText(QString::fromUtf8(mInputData));
         mRevertBtn->setVisible(false);
     }
 
     void updateRecipientsFromResult(const Kleo::Crypto::DecryptVerifyResult &result)
     {
         const auto decResult = result.decryptionResult();
 
         for (const auto &recipient: decResult.recipients()) {
             if (!recipient.keyID()) {
                 continue;
             }
 
             GpgME::Key key;
             if (strlen(recipient.keyID()) < 16) {
                 key = KeyCache::instance()->findByShortKeyID(recipient.keyID());
             } else {
                 key = KeyCache::instance()->findByKeyIDOrFingerprint(recipient.keyID());
             }
 
             if (key.isNull()) {
                 std::vector<std::string> subids;
                 subids.push_back(std::string(recipient.keyID()));
                 for (const auto &subkey: KeyCache::instance()->findSubkeysByKeyID(subids)) {
                     key = subkey.parent();
                     break;
                 }
             }
 
             if (key.isNull()) {
                 qCDebug(KLEOPATRA_LOG) << "Unknown key" << recipient.keyID();
                 mSigEncWidget->addUnknownRecipient(recipient.keyID());
                 continue;
             }
 
             bool keyFound = false;
             for (const auto &existingKey: mSigEncWidget->recipients()) {
                 if (existingKey.primaryFingerprint() && key.primaryFingerprint() &&
                     !strcmp (existingKey.primaryFingerprint(), key.primaryFingerprint())) {
                     keyFound = true;
                     break;
                 }
             }
             if (!keyFound) {
                 mSigEncWidget->addRecipient(key);
             }
         }
     }
 
     void cryptDone(const std::shared_ptr<const Kleo::Crypto::Task::Result> &result)
     {
         updateCommitButton();
         mDecryptBtn->setEnabled(true);
         mProgressBar->setVisible(false);
         mProgressLabel->setVisible(false);
 
         mLastResultWidget = new ResultItemWidget(result);
         mLastResultWidget->showCloseButton(true);
         mStatusLay->addWidget(mLastResultWidget);
 
         connect(mLastResultWidget, &ResultItemWidget::closeButtonClicked, q, [this] () {
             removeLastResultItem();
         });
 
         // Check result protocol
         if (mPGPRB) {
             auto proto = getProtocol(result);
             if (proto == GpgME::UnknownProtocol) {
                 proto = mPGPRB->isChecked() ? GpgME::OpenPGP : GpgME::CMS;
             } else if (proto == GpgME::OpenPGP) {
                 mPGPRB->setChecked(true);
             } else if (proto == GpgME::CMS) {
                 mCMSRB->setChecked(true);
             }
 
             KConfigGroup config(KSharedConfig::openConfig(), "Notepad");
             config.writeEntry("wasCMS", proto == GpgME::CMS);
         }
 
         if (result->errorCode()) {
             if (!result->errorString().isEmpty()) {
                 KMessageBox::error(q,
                         result->errorString(),
                         i18nc("@title", "Error in crypto action"));
             }
             return;
         }
         mEdit->setPlainText(QString::fromUtf8(mOutputData));
         mOutputData.clear();
         mRevertBtn->setVisible(true);
 
         const auto decryptVerifyResult = dynamic_cast<const Kleo::Crypto::DecryptVerifyResult*>(result.get());
         if (decryptVerifyResult) {
             updateRecipientsFromResult(*decryptVerifyResult);
         }
     }
 
     void doDecryptVerify()
     {
         doCryptoCommon();
         mSigEncWidget->clearAddedRecipients();
         mProgressLabel->setText(i18n("Decrypt / Verify") + QStringLiteral("..."));
         auto input = Input::createFromByteArray(&mInputData,  i18n("Notepad"));
         auto output = Output::createFromByteArray(&mOutputData, i18n("Notepad"));
 
         AbstractDecryptVerifyTask *task;
         auto classification = input->classification();
         if (classification & Class::OpaqueSignature ||
             classification & Class::ClearsignedMessage) {
             auto verifyTask = new VerifyOpaqueTask();
             verifyTask->setInput(input);
             verifyTask->setOutput(output);
             task = verifyTask;
         } else {
             auto decTask = new DecryptVerifyTask();
             decTask->setInput(input);
             decTask->setOutput(output);
             task = decTask;
         }
         try {
             task->autodetectProtocolFromInput();
         } catch (const Kleo::Exception &e) {
             KMessageBox::error(q,
                     e.message(),
                     i18nc("@title", "Error in crypto action"));
             mCryptBtn->setEnabled(true);
             mDecryptBtn->setEnabled(true);
             mProgressBar->setVisible(false);
             mProgressLabel->setVisible(false);
             return;
         }
 
         connect (task, &Task::result, q, [this, task] (const std::shared_ptr<const Kleo::Crypto::Task::Result> &result) {
                 qCDebug(KLEOPATRA_LOG) << "Decrypt / Verify done. Err:" << result->errorCode();
                 task->deleteLater();
                 cryptDone(result);
             });
         task->start();
     }
 
     void removeLastResultItem()
     {
         if (mLastResultWidget) {
             mStatusLay->removeWidget(mLastResultWidget);
             delete mLastResultWidget;
             mLastResultWidget = nullptr;
         }
     }
 
     void doCryptoCommon()
     {
         mCryptBtn->setEnabled(false);
         mDecryptBtn->setEnabled(false);
         mProgressBar->setVisible(true);
         mProgressLabel->setVisible(true);
         mInputData = mEdit->toPlainText().toUtf8();
         removeLastResultItem();
     }
 
     void doEncryptSign()
     {
+        if (Kleo::gnupgUsesDeVsCompliance() && !Kleo::gnupgIsDeVsCompliant()) {
+            KMessageBox::sorry(q->topLevelWidget(),
+                               xi18nc("@info %1 is a placeholder for the name of a compliance mode. E.g. NATO RESTRICTED compliant or VS-NfD compliant",
+                                      "<para>Sorry! You cannot use Kleopatra for signing or encryption "
+                                      "because the <application>GnuPG</application> system used by Kleopatra is not %1.</para>",
+                                      Formatting::deVsString()));
+            return;
+        }
+
         doCryptoCommon();
         mProgressLabel->setText(mSigEncWidget->currentOp() + QStringLiteral("..."));
         auto input = Input::createFromByteArray(&mInputData,  i18n("Notepad"));
         auto output = Output::createFromByteArray(&mOutputData, i18n("Notepad"));
 
         auto task = new SignEncryptTask();
         task->setInput(input);
         task->setOutput(output);
 
         const auto sigKey = mSigEncWidget->signKey();
 
         const std::vector<GpgME::Key> recipients = mSigEncWidget->recipients();
         const bool encrypt = mSigEncWidget->encryptSymmetric() || !recipients.empty();
         const bool sign = !sigKey.isNull();
 
         if (sign) {
             task->setSign(true);
             std::vector<GpgME::Key> signVector;
             signVector.push_back(sigKey);
             task->setSigners(signVector);
         } else {
             task->setSign(false);
         }
         task->setEncrypt(encrypt);
         task->setRecipients(recipients);
         task->setEncryptSymmetric(mSigEncWidget->encryptSymmetric());
         task->setAsciiArmor(true);
 
         if (sign && !encrypt && sigKey.protocol() == GpgME::OpenPGP) {
             task->setClearsign(true);
         }
 
         connect (task, &Task::result, q, [this, task] (const std::shared_ptr<const Kleo::Crypto::Task::Result> &result) {
                 qCDebug(KLEOPATRA_LOG) << "Encrypt / Sign done. Err:" << result->errorCode();
                 task->deleteLater();
                 cryptDone(result);
             });
         task->start();
     }
 
     void doImport()
     {
         doCryptoCommon();
         mProgressLabel->setText(i18n("Importing..."));
         auto cmd = new Kleo::ImportCertificateFromDataCommand(mInputData, mImportProto);
         connect(cmd, &Kleo::ImportCertificatesCommand::finished, q, [this] () {
                 mCryptBtn->setEnabled(true);
                 mDecryptBtn->setEnabled(true);
                 mProgressBar->setVisible(false);
                 mProgressLabel->setVisible(false);
 
                 updateCommitButton();
                 mRevertBtn->setVisible(true);
                 mEdit->setPlainText(QString());
             });
         cmd->start();
     }
 
     void checkImportProtocol()
     {
         QGpgME::QByteArrayDataProvider dp(mEdit->toPlainText().toUtf8());
         GpgME::Data data(&dp);
         auto type = data.type();
         if (type == GpgME::Data::PGPKey) {
             mImportProto = GpgME::OpenPGP;
         } else if (type == GpgME::Data::X509Cert ||
                    type == GpgME::Data::PKCS12) {
             mImportProto = GpgME::CMS;
         } else {
             mImportProto = GpgME::UnknownProtocol;
         }
     }
 
     void updateCommitButton()
     {
         mAdditionalInfoLabel->setVisible(false);
 
         checkImportProtocol();
 
         if (mImportProto != GpgME::UnknownProtocol) {
             mCryptBtn->setText(i18nc("1 is an operation to apply to the notepad. "
                                      "Like Sign/Encrypt or just Encrypt.", "%1 Notepad",
                                      i18n("Import")));
             mCryptBtn->setDisabled(false);
             return;
         }
 
         if (!mSigEncWidget->currentOp().isEmpty()) {
             mCryptBtn->setDisabled(false);
             mCryptBtn->setText(i18nc("1 is an operation to apply to the notepad. "
                                      "Like Sign/Encrypt or just Encrypt.", "%1 Notepad",
                                      mSigEncWidget->currentOp()));
         } else {
             mCryptBtn->setText(i18n("Sign / Encrypt Notepad"));
             mCryptBtn->setDisabled(true);
         }
 
         if (Kleo::gnupgUsesDeVsCompliance()) {
             const bool de_vs = Kleo::gnupgIsDeVsCompliant() && mSigEncWidget->isDeVsAndValid();
             mCryptBtn->setIcon(QIcon::fromTheme(de_vs
                         ? QStringLiteral("security-high")
                         : QStringLiteral("security-medium")));
             mCryptBtn->setStyleSheet(QStringLiteral("background-color: ") + (de_vs
                         ? KColorScheme(QPalette::Active, KColorScheme::View).background(KColorScheme::PositiveBackground).color().name()
                         : KColorScheme(QPalette::Active, KColorScheme::View).background(KColorScheme::NegativeBackground).color().name()));
             mAdditionalInfoLabel->setText(de_vs
                     ? i18nc("%1 is a placeholder for the name of a compliance mode. E.g. NATO RESTRICTED compliant or VS-NfD compliant",
                         "%1 communication possible.", Formatting::deVsString())
                     : i18nc("%1 is a placeholder for the name of a compliance mode. E.g. NATO RESTRICTED compliant or VS-NfD compliant",
                         "%1 communication not possible.", Formatting::deVsString()));
             mAdditionalInfoLabel->setVisible(true);
         }
     }
 
 private:
     PadWidget *const q;
     QTextEdit *mEdit;
     QPushButton *mCryptBtn;
     QPushButton *mDecryptBtn;
     QPushButton *mRevertBtn;
     QLabel *mAdditionalInfoLabel;
     QByteArray mInputData;
     QByteArray mOutputData;
     SignEncryptWidget *mSigEncWidget;
     QProgressBar *mProgressBar;
     QLabel *mProgressLabel;
     QVBoxLayout *mStatusLay;
     ResultItemWidget *mLastResultWidget;
     QList<GpgME::Key> mAutoAddedKeys;
     QRadioButton *mPGPRB;
     QRadioButton *mCMSRB;
     GpgME::Protocol mImportProto;
 };
 
 PadWidget::PadWidget(QWidget *parent):
     QWidget(parent),
     d(new Private(this))
 {
 }