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Is this algorithm patented? faragon 22:57, 2005 Jan 25 (UTC+1)

It technically should be. BC5 is just a variation of DXT5 (it uses two single-channel compression blocks), which is already under patent by S3. That being said, OpenGL incorporated RGTC into core in 3.0, yet they can't incorporate BC's 1-3 into core due to S3's patent. So... it's not clear. It may be that S3's patent only covers the tradition block compression 3-channel form, which would mean that anything that uses the BC1 compression would be covered. But if the single-channel additions in BC2 and 3 were not patented, then that could explain why OpenGL can incorporate them. In which case, BC5 would not be patented. Or at least, not by S3. Korval (talk) 18:18, 24 December 2014 (UTC)