This is the package signature as generated by The GnuPG. This signature identifies the party that created the package. By verifying it you are sure that the package coming from a trustworty person or organization.
Here is the package signature:
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iEYEABECAAYFAkyE5poACgkQqesEzEdeXBHU+QCfT6Pm+r40ZG8ePY5QCBSjJ5qR Ch8AnjmIorEHpoj41Wbw58/htcF9KRMV =DZeo -----END PGP SIGNATURE-----
You can save this signature in a text file (e.g. libmpcdec-1.2.6-i486-3gds.txz.asc) in the same directory where the package file (libmpcdec-1.2.6-i486-3gds.txz) resides and you can verify it by issuing the following command:
gpg --verify libmpcdec-1.2.6-i486-3gds.txz.asc
NOTE: You need to import the public key of SlackPack first:
gpg --import KEY