gregwtmtno parent
This is going to date me, but I had a t-shirt with basically a code-golf version of DeCSS printed on it and it said "This shirt is illegal" on it or something like that. I never actually wore it in public.
Oh, I definitely wore my Perl RSA "This shirt is a munition" T-shirt.
http://www.cypherspace.org/adam/shirt/
DeCSS was also available in DNS txt records for a while circa 2000.