The doc/FAQ states:
'''
The official GnuPG distribution does not contain IDEA due to a patent restriction. The patent does not expire before 2007 so don't expect official support before then. However, there is an unofficial module to include it even in earlier versions of GnuPG. It's available from <ftp://ftp.gnupg.dk/pub/contrib-dk/>. Look for:
'''
whereas ftp://ftp.gnupg.dk/pub/contrib-dk does not work anymore.
Please change it for ftp://ftp.gnupg.dk/contrib-dk/idea.c.gz.
Also it would be nice to add some information about NO-SUPPORT whoever for IDEA
on GnuPG2.