didn't read it, but someone told on a forum that Microsoft's patent is about dynamically updated rANS probabilities during decoding -- JPEG XL is about static rANS codes, the codes are never changed/updated during decoding, they are context modeled and already clustered at encoding time, which makes it faster to decode than dynamically updated codes
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I wouldn't be surprised if this is more a legal issue since Microsoft was granted a patent on rANS encoding, which is used in JPEG-XL: https://www.theregister.com/2022/02/17/microsoft_ans_patent/
didn't read it, but someone told on a forum that Microsoft's patent is about dynamically updated rANS probabilities during decoding -- JPEG XL is about static rANS codes, the codes are never changed/updated during decoding, they are context modeled and already clustered at encoding time, which makes it faster to decode than dynamically updated codes
I doubt it's related to that. That patent is too recent to affect JPEG XL.