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update OpenCV licensing
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‎LICENSE-3RD-PARTY.txt

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OpenCV library is redistributed within opencv-python package.
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This license applies to OpenCV binary in the directory cv2/.
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By downloading, copying, installing or using the software you agree to this license.
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If you do not agree to this license, do not download, install,
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copy or use the software.
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License Agreement
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For Open Source Computer Vision Library
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(3-clause BSD License)
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Copyright (C) 2000-2020, Intel Corporation, all rights reserved.
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Copyright (C) 2009-2011, Willow Garage Inc., all rights reserved.
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Copyright (C) 2009-2016, NVIDIA Corporation, all rights reserved.
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Copyright (C) 2010-2013, Advanced Micro Devices, Inc., all rights reserved.
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Copyright (C) 2015-2016, OpenCV Foundation, all rights reserved.
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Copyright (C) 2015-2016, Itseez Inc., all rights reserved.
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Copyright (C) 2019-2020, Xperience AI, all rights reserved.
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Third party copyrights are property of their respective owners.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the names of the copyright holders nor the names of the contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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This software is provided by the copyright holders and contributors "as is" and
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any express or implied warranties, including, but not limited to, the implied
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warranties of merchantability and fitness for a particular purpose are disclaimed.
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In no event shall copyright holders or contributors be liable for any direct,
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indirect, incidental, special, exemplary, or consequential damages
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(including, but not limited to, procurement of substitute goods or services;
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loss of use, data, or profits; or business interruption) however caused
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and on any theory of liability, whether in contract, strict liability,
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or tort (including negligence or otherwise) arising in any way out of
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the use of this software, even if advised of the possibility of such damage.
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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1. Definitions.
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libvpx is redistributed within all opencv-python Linux packages.

‎README.md

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Opencv-python package (scripts in this repository) is available under MIT license.
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OpenCV itself is available under [3-clause BSD License](https://github.com/opencv/opencv/blob/master/LICENSE).
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OpenCV itself is available under [Apache 2](https://github.com/opencv/opencv/blob/master/LICENSE) license.
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Third party package licenses are at [LICENSE-3RD-PARTY.txt](https://github.com/skvark/opencv-python/blob/master/LICENSE-3RD-PARTY.txt).
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