Ever wondered if a number could be illegal ? Probably not. but there is one that is indeed illegal in the USA since the 1998 Digital Rights Act.
85650789657397829 + 1402 more digits is an illegal number. Using this number, you would be able to duplicate, download, or upload the data on the DVD. Not that many people use DVDs anymore, but this number can also help unlock secure data on your computer.
this very serious matter is explained further in the video below: