By Michael Lipkin (April 10, 2015, 8:12 PM EDT) -- Patent-holding company Personal Audio LLC lost its battle Friday to preserve a media distribution patent used to sue podcasters including CBS Corp. and Adam Carolla when the U.S. Patent and Trademark Office ruled that five key claims were invalidated by prior art.
The PTO's Patent Trial and Appeal Board sided with the Electronic Frontier Foundation in its bid to challenge the podcasting patent, finding that it would have been obvious under a CNN video site and anticipated by technology tested by the Canadian Broadcasting Corp.
The EFF cautioned the PTO to reject Personal Audio's attempts to obtain future podcasting patents and...
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