Is SURF for CUDA is free

C++
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1

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;

2

When will it be marked as FREE?

https://portal.unifiedpatents.com/patents/patent/US-6711293-B1

3

open an issue on the github?