We can try applying your narrative to the number 3.14, supposing laws had made finding the circumference of a circle illegal. Sure, "3.14" isn't illegal on its own (and sometimes it even shows up in the amount of change you're owed). But referencing the number is basically referencing a specific use. And so we can infer that the people broadcasting the number are doing so to highlight how easy finding the circumference of a circle is, and thus induce people to do so.

The informational content of 3.14 is say 12 bits and the original AACS key is 128 bits. Whereas a movie is roughly 10,000,000,000 bits, and even a song is around 32,000,000 bits. These "illegal primes" are very close, if not in, the domain of bona fide facts. And the law generally doesn't criminalize facts (like 3.14), although not for lack of trying!