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Welcome. You are free to use all my photos for free. My photos are licensed under Creative Commons Attribution United States License for your legal protection. So you are FREE (as for beer) to copy, distribute, display, perform the work, and to make derivative works, including for commercial use.
You may use any of my photos to repost in the Internet, make calendars or any other object, use it in other media production, print them for sale, etc... You do not need special permissions, because all possible permissions you might ever need are hereby granted. If you want to give credit, just give it to mike gnuckx. Enjoy. :-)