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The XREngine IK system is derived from Exokit Avatars, created and maintained
by Avaer Kazmer.
https://github.com/exokitxr/license

Derivations of this code are also used in Avaer's new project, Webaverse.
Find out more here: https://webaverse.com/

The original license is provided here as is.

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MIT LICENSE

Copyright 2019 Avaer Kazmer

Permission is hereby granted to run and distribute verbatim copies of this software for any purpose.

The copyright holder additionally grants an MIT License to this software to sponsors per terms at https://github.com/sponsors/modulesio

The full text of the MIT License can be found at https://github.com/exokitxr/ismit/blob/master/MIT-LICENSE.txt

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.