Do you have any sources on that? And who would be the one making any claims relevant to JPEG XL or asking for royalties?
Because I have not seen anyone other than Cloudinary and Google declare to have patents relevant to JPEG XL, and those two parties have explicitly granted royalty-free licenses. So to me the situation is as clear as it gets.
Of course it can always happen with anything less than 20 years old that a patent troll appears and makes claims. This has not happened yet though in the case of JPEG XL.
Because I have not seen anyone other than Cloudinary and Google declare to have patents relevant to JPEG XL, and those two parties have explicitly granted royalty-free licenses. So to me the situation is as clear as it gets.
Of course it can always happen with anything less than 20 years old that a patent troll appears and makes claims. This has not happened yet though in the case of JPEG XL.