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The license was designed for manuals, textbooks, other reference and instructional materials, and documentation which often accompanies GPL software. However, it can be used for any text-based work, regardless of subject matter. The largest project using the license is Wikipedia, a general-purpose encyclopedia, but the license is not particularly popular among other projects.
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As of the current versions, all Creative Commons licenses allow the "core right" to redistribute a work for non-commercial purposes without modification. The Non-commercial and No derivatives options will make a work non-free.
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All articles and images on BackDrop.net are copyright protected.
Most of the articles and images on SM-201 have been incorporated from other GFDL sites.
Some of the articles and images on SM-201 are copyright protected by their authors.
If in doubt, drop me an email and provide the name of the article or image, and what you wish to use it for. I will endeavor to contact the creator for you.