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What is the patented algorithm used by OpenCV?

I am using the OpenCV of 2.4. What is the patented algorithm used by OpenCV? I know that SURF and SIFT. Is there more? Also, used for calibration "FindChessboardCorners" and "FindCirclesGrid" This patent algorithm? Thanks for reading. Please answer.

What is the patented algorithm used by OpenCV?

I am using the OpenCV of 2.4. What is the patented algorithm used by OpenCV? I know that SURF and SIFT. Is there more? Also, used for calibration "FindChessboardCorners" and "FindCirclesGrid" This patent algorithm? Thanks for reading. Please answer.