Merge pull request #10804 from jmacdotorg/about-license

Clarify the purpose of the MIT license.

Author: jmacdotorg

getting_started/introduction/godot_design_philosophy.rst

@@ -99,9 +99,12 @@ Open source
 -----------
 
 Godot offers a fully open source codebase under the **MIT license**.
-This means all the technologies that ship with it have to be Free
-(as in freedom) as well.
-For the most part, they're developed from the ground up by contributors.
+This means that the codebase is free for anyone to download, use,
+modify, or share, as long as its license file is kept intact.
+
+All technologies that ship with Godot, including third-party libraries, must
+be legally compatible with this open source license. Therefore, most parts
+of Godot are developed from the ground up by community contributors.
 
 Anyone can plug in proprietary tools for the needs of their projects —
 they just won't ship with the engine. This may include Google AdMob,