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ASTC usage follows ARM's [END USER LICENCE AGREEMENT FOR THE MALI ASTC SPECIFICATION AND SOFTWARE CODEC license agreement](https://github.com/ARM-software/astc-encoder/blob/master/LICENSE.md). Note the ASTC texture format is the only standard we could identify that is covered by an explicit end user license, and we believe our use case is covered by this license.
-PVRTC1/2: See the [PVRTC Specification and User Guide](https://www.imgtec.com/downloads/download-info/pvrtc-texture-compression-user-guide-2/). Imagination Technologies Limited, 23 Nov 2018. Also see the [Khronos Data Format Specification](https://www.khronos.org/registry/DataFormat/specs/1.1/dataformat.1.1.html). See [PVR Texture Compression Exploration](https://roartindon.blogspot.com/2014/08/pvr-texture-compression-exploration.html) and [PvrTcCompressor](https://bitbucket.org/jthlim/pvrtccompressor/src) Also see [Texture Compression Techniques](http://sv-journal.org/2014-1/06/en/index.php?lang=en#7-3)
+PVRTC1/2: See the [PVRTC Specification and User Guide](https://www.imgtec.com/downloads/download-info/pvrtc-texture-compression-user-guide-2/). Imagination Technologies Limited, 23 Nov 2018. Also see the [Khronos Data Format Specification](https://www.khronos.org/registry/DataFormat/specs/1.1/dataformat.1.1.html). See [PVR Texture Compression Exploration](https://roartindon.blogspot.com/2014/08/pvr-texture-compression-exploration.html) and [PvrTcCompressor](https://bitbucket.org/jthlim/pvrtccompressor/src). Also see [Texture Compression Techniques](http://sv-journal.org/2014-1/06/en/index.php?lang=en#7-3).
ETC1 and ETC2 EAC: See the [Khronos Data Format Specification](https://www.khronos.org/registry/DataFormat/specs/1.1/dataformat.1.1.html) and the [OpenGL 4.5 Core Profile](https://www.khronos.org/registry/OpenGL/specs/gl/glspec45.core.pdf) Appendix C.
