I believe that's the copyright law on every piece of media made (DVD's, CD's, etc.). Technically the disc is only for you to watch and listen to, if a DJ wanted to use it in a bar or club it would be illegal. If you want to go deep into it, it's illegal to lend a CD to your friend and have a ripped version or burned version still in your possession. At least that's how it is in Canada and I believe the United States.