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Written by Aras Pranckevičius on 2025-01-13 at 08:46

So here's a question: OpenEXR. There's "open" in the name! But, it contains DWAA/DWAB compression modes. Which, supposedly, are patented. OpenEXR license just says "BSD" but if you look at "PATENTS" file in the repo, it says that Dreamworks allows you to use/modify/distribution "implementation of DreamWorks Lossy Compression within the OpenEXR standard".

Now... what does that mean? Can a different EXR decoding library implement DWA decompression?

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Toot

Written by slembcke on 2025-01-13 at 15:41

@aras Hrm, I mean OpenGL and h.264 are open standards, but not open source. I suppose they probably mean it more like that. You are allowed to know how it works, but it’s not necessarily free in any sense of the word.

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