The FlowPlayer Free version is released under GNU GENERAL PUBLIC LICENSE 
Version 3 (GPL). 

Note that the GPL requires that you don't remove the Flowpayer copyright notices
from the user interface. See section 5.d below.

Commercial licenses are available. The commercial player version does 
not have any Flowplayer logos or texts.

GNU GENERAL PUBLIC LICENSE - see: http://www.gnu.org/licenses/gpl-3.0.html