I'm developing a 2D physics platformer game, with commercial purposes. Almost everything is finished:

* An original game concept
* The whole 2D self-written game engine
* A level interpreter to read xml levels
* A level editor with an advanced GUI to generate levels in xml
* An advanced level object system
* Profile manager (load & save game progress)
* etc ...

But, my problems are of course inspiration for levels...

Is it possible to publish my game concept and ask community for level designs? And still keep my game concept save from being copied by others. Do I have copyrights on a game concept for a game which isn't officially released?

And if I should ask community, should I do an action like, for everyone who submits an approved level design (not the xml, but only a sketch), they receive one cent per sold copy of the game?

What do you think? Tips, pitfalls?

Thank you in advance!

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For the interested people, here is a screenshot from the level-editor:

[Fullscreen image](https://i.stack.imgur.com/2WNG2.jpg)
![enter image description here](https://i.stack.imgur.com/2WNG2.jpg)