In 2002, Baen also started adding CD-ROMs into some hardcovers of newest titles in successful series. They contain the complete series of novels preceding the printed book (for those books that were the latest in a series), other works by the same author, some works by other authors, and multimedia bonuses. The CD-ROMs have a prominent permissive copyright license which expressly encourages free-of-charge copying and sharing, including over the Internet.[5]