(a)
concept of taking common
ideas,
images,
phrases, etc. of the
advertising medium and using them against this
machine which seems to be headed towards
self-destruction. For
prime examples of subvertising see
Adbusters.org.
(b) the name of another good example, subvertise.org, which offers many picture files (t-shirts posters or stickers) which go "against the grain". Most carry the copyleft or anticopyright symbols.