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 v1.4.2 (GNU/Linux) iD8DBQBD27dAqesEzEdeXBERAiSvAJ90AOfH8Me5PmWIx7+NJEEaz3VJ2gCaA4RK yyTUJDXvewnXjG0wyE0jjgA= =GvIt -----END PGP SIGNATURE-----
You can save this signature in a text file (e.g. motion-3.2.4-i686-2gds.tgz.asc) in the same directory where the package file (motion-3.2.4-i686-2gds.tgz) resides and you can verify it by issuing the following command:
gpg --verify motion-3.2.4-i686-2gds.tgz.asc
NOTE: You need to import the public key of SlackPack first:
gpg --import KEY