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opencv code is mit-licensed, thus free to use in a commercial app, there are 2 exceptions i know of:

• SURF & SIFT: patented, thus non-freenon-free (but you can try to get a license from the authors)
• the mcs_* * xml cascades, Creative Commons Attribution-NonCommercial 4.0 International Public License, meaning, you must not use them for any commercial purpose.

opencv code is mit-licensed, thus free to use in a commercial app, there are 2 exceptions i know of:

• SURF & SIFT: patented, thus non-free (but you can try to get a license from the authors)
• the mcs_* * xml cascades, Creative Commons Attribution-NonCommercial 4.0 International Public License, meaning, you must not use them for any commercial purpose.

opencv code is mit-licensed, thus free to use in a commercial app, there are 2 exceptions i know of:

• SURF & SIFT: patented, thus non-free (but you can try to get a license from the authors)
• the mcs_* * xml cascades, Creative Commons Attribution-NonCommercial 4.0 International Public License, meaning, you must not use them for any commercial purpose.

(if anyone finds more, please append !)

opencv code is mit-licensed, thus free to use in a commercial app, there are 2 exceptions i know of:

• SURF & SIFT: patented, thus non-free (but you can try to get a license from the authors)
• the mcs_* * xml cascades, Creative Commons Attribution-NonCommercial 4.0 International Public License, meaning, you must not use them for any commercial purpose.

(if anyone finds more, please append !)

For SURF --> it is noncommercial licensed: http://www.vision.ee.ethz.ch/~surf/download.html

For SIFT --> As discussed here the SIFT patent is a US patent and it does not have a EU counterpart so in Europe you can use it without any hesitation.