# Is SURF for CUDA is free

**URL:** <https://forum.opencv.org/t/is-surf-for-cuda-is-free/3985>\
**Category:** C++\
**Tags:** cuda, legal\
**Created:** [June 23, 2021, 2:19pm UTC](https://forum.opencv.org/t/is-surf-for-cuda-is-free/3985 "2021-06-23T14:19:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Christophe\_Jacquelin](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/christophe_jacquelin/32/135_2.png) [@Christophe\_Jacquelin](https://forum.opencv.org/u/Christophe_Jacquelin)\
**Post date:** [June 23, 2021, 2:19pm UTC](https://forum.opencv.org/t/is-surf-for-cuda-is-free/3985/1 "2021-06-23T14:19:37Z")

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Hello,  
Is Surf for CUDA is free, The patent is over but we have to set the Flag NON FREE in Cmake ?  
SURF or ORB what is the best one ?  
Thanks;

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**Author:** ![trausch](https://avatars.discourse-cdn.com/v4/letter/t/e68b1a/32.png) [@trausch](https://forum.opencv.org/u/trausch)\
**Post date:** [July 5, 2023, 11:07am UTC](https://forum.opencv.org/t/is-surf-for-cuda-is-free/3985/2 "2023-07-05T11:07:58Z")

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When will it be marked as FREE?

[https://portal.unifiedpatents.com/patents/patent/US-6711293-B1](https://portal.unifiedpatents.com/patents/patent/US-6711293-B1)

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<div class="post-metadata">

**Author:** ![crackwitz](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/crackwitz/32/14_2.png) [@crackwitz](https://forum.opencv.org/u/crackwitz)\
**Post date:** [July 5, 2023, 3:58pm UTC](https://forum.opencv.org/t/is-surf-for-cuda-is-free/3985/3 "2023-07-05T15:58:09Z")

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open an issue on the github?