Blender Is Free Software

You can keep all rights of your own work, but if you publish or sell or share Blender code, you do it under the same conditions, just as Free as Blender is. The bridges (if using Blender code) have to be fully GPL compatible. Since 2002 dozens – maybe even hundreds – of people have devoted years of their life to making Blender open and free to use for everyone.

Source: code.blender.org