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indeed, the patent expired, so SIFT could be moved away from the nonfree xfeatures2d module in the opencv_contrib repo.

opencv versions from 4.4.0 or 3.4.11 onwards have it in the features2d module in the main repo, and there are no restrictions to use it.

indeed, the patent expired, so SIFT could be moved away from the nonfree xfeatures2d module in the opencv_contrib repo.

opencv versions from 4.4.0 or 3.4.11 onwards have it in the features2d module in the main repo, repo, and there are no restrictions to use it.