Pinterest's rise could be slowed by photographers and other content owners who say the site's users are illegally repurposing copyrighted materials to create their collages. The network is struggling to scale up its process for handling copyright complaints, and likely will need a licensing system in order to avoid further headaches. "The good news is that cash is already rolling in. ... Spreading some of that money around will make Pinterest popular with copyright owners in no time," Jeff Roberts writes.
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