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If I understand it correctly, under the Oledrion license of the GPL, the original author(s) retains the copyrights to the code they develop; however you are free to use and build upon it as you desire SO LONG AS you retain all the copyright and credit information as originally presented to the OS community. So, yes, you may move it forward build upon it, etc. You may not sell the code (but you may sell a service that uses the code underneath it). Thus, if you distribute code, and the code contains others copywritten works, then you must include the credits.
Clear as mud?