>>69
The GPL was made to insure the freedom of software, by doing so it obviously has to restrict you from making GPL code proprietary.
You can't "make" code proprietary, that's a common misconception. The distorting and confusing idea did not arise by accident. Companies that gain from the confusion, like MySQL AB (and now Sun), promoted it. The clearest way out of the confusion is to reject the idea entirely.
When someone "takes" your code and does something to it, it doesn't affect your own copy of the code at all. Code is information, not a physical object, it is copied, not moved, so it can't be "stolen" or "made proprietary". You better stop listening to propaganda and start thinking for yourself.