swatch-2.2.tar - Unix tar file of swatch-2.2 directory and files swatch-2.2.tar.asc - PGP signature of swatch-2.2.tar swatch-2.2.tar.Z - swatch-2.2.tar compressed with Unix compress swatch-2.2.tar.gz - swatch-2.2.tar compressed with GNU gzip If you have PGP you can verify the swatch tar file with the swatch-2.2.tar.asc detached signature file. The swatch-2.2.tar.asc file is signed with the key for user ID: SUNSeT Team , Key ID 736EEC29. This same information applies to the swatch-3* files. You can get this key from any of the public PGP key servers, by fingering security-key@netserver.stanford.edu, or by viewing the web page http://www.stanford.edu/~security/.