OpenCV 2.46 and SurfFeatureDetector

If you use SurfFeatureDetector function, you should include "opencv2\nonfree\nonfree.hpp" and "opencv_nonfree246.lib" .

This mean is surf and sift is not free, give the money to use in commercially.
But how to know using this lib or not?
em..
I don't know.

Thank you.

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