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To make it GPLv2 compatible. You can just ignore the patent grant. Patent licenses and copyright licenses are different things, and GPLv2 only talks about copyright, which is the reason Apache 2.0 is considered incompatible with GPLv2: in Apache 2.0 your copyright license is conditioned on not engaging in patent litigation, while GPLv2 has no such condition. By separating things into a permissive copyright license and a defensive patent license, this problem is avoided. The av1 encoder libaom does exactly the same thing as libjxl, by the way.
Interesting, I'll have to do some more research. It turns out Google uses the same BSD 3-Clause + Patent Grant files for Go too.
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