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This really sucks and these guys are vultures, this could mean any business you start could have some dude coming after you saying he thought of it first, wow.
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Well it's not really as simple as that....regarding the ebay case, the person that sued ebay wasn't just "some guy", he actually owned patents that ebay were infringing or seemed to be infringing.

If you patent and idea and someone infringes it don't you have a right to claim?....I'd say you do, otherwise what is the point of patenting?