WIPO had recognized the complexity inherent in copyrighting video games, saying: "Although Article 2 of the Berne Convention provides a solid basis for eligibility for protection of video games by copyright, they are in fact complex works of authorship, potentially composed of multiple copyrighted works." WIPO has also stated in one of its reports that "there is no clear classification of video games and their protection will vary depending on each particular game and the elements that are part of it. In this sense, video games can be treated as computer programs and, thus, are classified as works of authorship; in that case, the source code for a video game is classified as a literary work.