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https://github.com/flowplayer/flowplayer/blob/dev/LICENSE.md

The Flowplayer Free version is released under the GNU GENERAL PUBLIC LICENSE Version 3 (GPL). The GPL requires that you not remove the Flowplayer logo and copyright notices from the user interface. See section 5.d below.

You may convey a work based on the Program, or the modifications to produce it from the Program, in the form of source code under the terms of section 4, provided that you also meet all of these conditions: * If the work has interactive user interfaces, each must display Appropriate Legal Notices;