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Free software license:
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This screenshot either does not contain copyright-eligible parts or visuals of copyrighted software, or the author has released it under a free license (which should be indicated beneath this notice), and as such follows the licensing guidelines for screenshots of Wikimedia Commons. You may use it freely according to its particular license.
Free software license:
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As such, portions of this screenshot may be licensed under two or three separate licenses. The GPL and GFDL are not the same license; they are only connected through the Free Software Foundation, the creator of the licenses.
Note: if the screenshot shows any work that is not a direct result of the program code itself, such as a text or graphics that are not part of the program, the license for that work must be indicated separately.