US laws place restrictions on the export of defense articles, which
includes some types of cryptographic software.  PGP and ssh fall into
this category.

To prevent anyone from taking unnecessary legal risks, certain Debian
GNU/Linux packages are only available from a non-US site:

ftp://os.inf.tu-dresden.de/pub/debian-non-US/

A list of mirror sites is at
ftp://os.inf.tu-dresden.de/pub/debian-non-US/README.mirrors