* RIBNITZ Robert writes:
More precisely, I am unclear about the terms Free Software and OPen Source Software. Do you know of any Software that is both open source, and non-free, or that is free, but not Open Source?
All Free Software is Open Source Software. But not all Open Source software is Free Software. Xv and Qt (before QPL) are for example Open Source software but not Free software. I suggest hat you read what the FSF has to say about this [1].
Are theses distictions anything else than a political choice?
Yes, Free Software is based on ethical and moral principals, Open Source software is not, it is based on pragmatism.
[1] http://www.gnu.org/philosophy/free-software-for-freedom.html