Can I sell my application if it was compiled within linux ??
(a) It is legal to sell your applications. You may take as much money as you want. (b) Simply using a GNU tool to develop your application does not affect your copyright to your applications. This includes (c) However, your copyright is affected if you include code from other GNU applications into yours. In this case, you have to put the resulting (“derived”) work under the GNU copyleft. That means, that you have to release source code upon request, and that your customer(s) may distribute (and/or sell!) copies of your source code and/or binary. (d) 99% of all C programs written are linked against the C library. Linking means, that you include GNU code into your program. However, the C library is released under special terms (GNU Library Public License, GLPL), which allows linking as an exception to what is said in c). You can link with the C library at will, but you have to provide your program in a form, that the user can update the library. In case of shared linking, this is not a p