I am not a lawyer
So I went to this great site called: http://creativecommons.org and answered some questions for you.
Here try it yourself: which license should I choose for my product?
The engine source belongs to me, any contributions made to the engine by users are *non-exclusively* a part of that.
Which means you do not which to waive your copyright. Right?
Code added to the engine by a contributor is just a part of the engine and the contributor can still use that code outside of the engine freely still.
Do what ever they like CC
The engine requires a lincse to use commerically which can be negotiated with me.
as long as it is non commercial NC
The engine is free to use non-profit
Once again a NC case, until something else is accepted.
You want people be able to do this:
You are free:
- to Share — to copy, distribute and transmit the work
- to Remix — to adapt the work
Under the following conditions:
Attribution — You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
Noncommercial — You may not use this work for commercial purposes.
Hope that helps. Oh by the way that website is a great thing
Was this what you wanted?