# License

### Open Source License

OpenSubdiv is covered by a modified Apache 2.0 license (included below), and is free to use for commercial or non-commercial use. All Pixar patents in the area of subdivision surface algorithms have also been released for public use. We welcome any involvement in the development or extension of this code; in fact, we would love it. Please contact us if you are interested.

For information on Apache licenses, see: http://www.apache.org/licenses/

The following license text describes the open source policy adopted by Pixar and is included in every source file.

    Copyright 2013 Pixar

    Licensed under the Apache License, Version 2.0 (the "Apache License")
    with the following modification; you may not use this file except in
    compliance with the Apache License and the following modification to it:
    Section 6. Trademarks. is deleted and replaced with:

    6. Trademarks. This License does not grant permission to use the trade
       names, trademarks, service marks, or product names of the Licensor
       and its affiliates, except as required to comply with Section 4(c) of
       the License and to reproduce the content of the NOTICE file.

    You may obtain a copy of the Apache License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the Apache License with the above modification is
    distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    KIND, either express or implied. See the Apache License for the specific
    language governing permissions and limitations under the Apache License.