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GPL dependencies

I recognized that OpenCV has some GPL licensed dependencies.

For example ldd tells me (on Ubuntu 14.04) that /usr/lib/x86_64-linux-gnu/ dynamically links (among many others) /usr/lib/x86_64-linux-gnu/ and /usr/lib/x86_64-linux-gnu/ Both, libjbig and libxvidcore, are licensed under GPLv2.

But OpenCV is licensed under BSD. How does this comply with the terms of the GPL. The GPL states (ยง2.b):

You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License.

Shouldn't OpenCV (or at least the high GUI module) also be licensed under GPLv2?

And what happens to closed source applications that are using OpenCV?