: This is likely an internal tracking code or part of a series (e.g., "Archive Series 122") used by the release group or the website to organize their library.
: This specific naming convention is almost exclusively used for the unauthorized distribution of copyrighted films. www.peliculas-dvdrip.com-CAS-as122.rar
: Many files from sites like these are "password-protected." The password is usually the URL of the website included in the filename. : This is likely an internal tracking code