A federal appeals court on Friday upheld a ruling that invalidated a patent owned by Affinity Labs of Texas LLC, a serial plaintiff in patent infringement cases against Apple and other tech companies. Reuters further noted that the U.S. Court of Appeals for the Federal Circuit affirmed a determination by the U.S. Patent and Trademark Office that an Affinity patent relating to file downloading was invalid as obvious.

One of the patent lawsuits filed by Affinity against Apple was filed back in 2009. Reuters didn't list the specific patent that was invalidated on Friday.

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