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For the curious, a quick search yields claims of 2025 and 2028 as the last patent expiration date. This announcement shouldn't please anyone.



How can that be if the standard was ratified in 2003?

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Perhaps some of the patents cover optimizations that don't affect the bitstream format. Or maybe they're just bogus patents.

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Some of the patents may have been applied for, but not granted until after ratification.

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For patents filed after 1995 the patent term is based on the filing date of the application, not the date the patent is granted.

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