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Zine editors used a variety of tactics in an attempt to slow what they felt to be illegal copying of zines and zine piracy. One practice was the use of colored stamps.
From Slime Trails, a Real Ghostbusters anthology, "This publication cannot be sold en masse without the handwritten consent of the editor, excluding only single copy sales sold as used. If you don't see a purple stamp of a cat on this page, you're reading an illegal copy of this zine. Please send the illegal copy to me along with the name and (hopefully) address of the person(s) you bought it from, and I'll send you a free zine and give you my undying gratitude."