RTMark is an activist collective that subverts the "Corporate Shield" protecting US corporations. The name is derived from "Registered Trademark".
RTMark is itself a registered corporation which brings together activists who plan projects with donors who fund them. It thus operates outside the laws governing human individuals, and benefits from the much looser laws governing corporations.
RTMark claimed as its first prank the "Barbie Liberation Organization", in which the voiceboxes of talking Barbie and G.I. Joe toys were swapped, and the toys then returned to the store (1993). The first prank documentable as being truly RTMark-sponsored was the SimCopter "hack" (1996), carried out by founding member Jacques Servin.
Other RTMark stunts were gwbush.com (a faked campaign Website for George W. Bush), and voteauction. They were also involved in the toywar.