There were patent concerns when they were first released, but AFAIK they were all eventually resolved. The issue really was lack of (perceived) quality. Despite

There were patent concerns when they were first released, but AFAIK they were all eventually resolved. The issue really was lack of (perceived) quality. Despite their amazing PSNR scores, wavelets look terrible at low bitrates, in ways that DCT-based codecs do not. JPEG XR has a few more features than JPEG, but not really much better quality [1]. [1] https://web.archive.org/web/20160404051240/http://people.mozilla.org/~josh/lossy_compressed_image_study_july_2014/ https://web.archive.org/web/20160404051240/http://people.moz...