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I just wrote a DTXn loader in my OpenGL engine to support .dds files (i.e. via glCompressedTexImage2D) and generally employ texture compression in GPU.

I've also found that using S3TC leads to patent issues. I've done some searching and found that on wikipedia:

The patent on S3 Texture Compression expires on October 2, 2017.

Does this message means that in about 1 year S3TC algorithms could be open-sourced without patents and could be used freely and should just wait?

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That patents shouldn't touch you (as mere user of OpenGL api) at all, unless you're writing own OpenGL/D3D implementations and adding texture compression support there. Then you'll have to pay attention.

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  • \$\begingroup\$ i see.. so these patents are only for custom S3TC implementations and not if you're just using whatever supported by your GPU via some api. Thanx! \$\endgroup\$
    – vlzvl
    Dec 3, 2016 at 15:40

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