No, you can not. If you base your work on a piece of software that it GPL/GNU you have to release everything you base on this code to the public as well.
Please note: I'm talking about source code, not about work you create with a GPL/GNU piece of software (like a picture with an OS graphic program). You don't have to make the resulting work of an OS product OS, that's correct.
Quote:
Originally posted by Imperator Fyron:
You only have to release the code of the parts that are open sourced. You can still keep parts of programs entirely written by you closed source.
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