Open Journal Systems supports the PKP PN, LOCKSS, & Internet Archive system to ensure a secure and permanent archive for the journal. The Internet Archive is a non-profit digital library whose mission is universal access to all knowledge. The Internet Archive provides permanent storage and free public access to a collection of digital materials, including websites, music, motion pictures, and nearly three million public domain books. Each archive is continually validated against other library caches, and if content is found to be corrupted or lost, the other caches or the journal is used to restore it.