When the first DVD cracking util was released, DeCSS, it violated the DMCA and people were getting sued and threatened with felonies for sharing it. Very quickly people figured out loopholes to make it an archivable creative work, like putting it on tshirts and encoding it as a prime number: https://en.m.wikipedia.org/wiki/Illegal_prime

The first thing that comes to mind is Meshtastic: https://meshtastic.org/

Oh wow that’s weird. Stargate SG-1 also had an episode where a Lt. Tyler turned out to be an alien infiltrator in disguise: “The Fifth Man”.