Incompatible licenses in upper-body detector

[tlind]

As we were dealing with the same issue in spencer_people_tracking, I want to briefly document a licensing issue with the upper-body detector:

• CPoint.cpp/.h in upper_body_detector is licensed under GPL (see file header). Due to the copy-left effect, this would require the entire ROS package to be licensed under GPL.
• KConnectedComponentLabeler.cpp/.h (which does #include the GPL code), however, is only licensed for "adademic or research purposes" without restrictions. So the KConnectedComponentLabeler component by itself already violates the GPL.
• The entire ROS package is licensed under the BSD license, which is incompatible with both the GPL and the academic/research-only license.

To get rid of the license violation, in spencer_people_tracking we removed the CPoint class in 11c5507ef, and changed the license of the entire ROS package from BSD to a proprietary academic/research-only license (41152bd9).

Please feel free to copy these modifications, for academic or research purposes ;-)

[lucasb-eyer]

Good one, thanks for the ping!