Ebay's Verified Rights Owner's Program (gosh that's awful). The purpose of this is to allow manufacturers of products to prevent sales by unauthorized vendors.
"Naw", you protest, "if I own it, surely I can sell it?". Nope. At least not on Ebay.
http://www.kuro5hin.org/story/2004/12/3/92549/2461 tells a story of a woman trying to get rid of some unwanted gifts and running afoul of this.
Doesn't fit my view of a free society.
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