An interesting article about the history of the '486' cpu

ISTR it being printed on tee-shirts too.

Are you confusing with DeCSS ... from wipipedia ...

"In protest against legislation that prohibits publication of copy protection circumvention code in countries that implement the WIPO Copyright Treaty (such as the United States' Digital Millennium Copyright Act), some have devised clever ways of distributing descriptions of the DeCSS algorithm, such as through steganography, through various Internet protocols, on T-shirts and in dramatic readings, as MIDI files, as a haiku poem (DeCSS haiku),[8][9] and even as a so-called illegal prime number.[10]"

I've had to check, as I was working from memory. I was sort of right. The tee-shirts were about RSA encryption, which was one of the methods used by PGP.