What kind of content restrictions does Apple have for media? The rules must be less onerous than the restrictions for apps. Social norms allow for a lot of sex

What kind of content restrictions does Apple have for media? The rules must be less onerous than the restrictions for apps. Social norms allow for a lot of sex in music, movies, and books. If Apple were to enforce app content standards for media, then hoards of famous works would be excluded, including most of rock n' roll.