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Most of OpenIntro's resources, including the Statistics textbooks, are released under a Creative Commons BY-SA 3.0 license. Some files are downloaded in a zip directory (or Github repository) include a Read Me file and provide special guidelines to fulfill the attribution component of the license is fulfilled. Derivative works should also be clearly licensed under the Creative Commons BY-SA 3.0 license, e.g. by linking to the CC license, so that others may continue to benefit from sharing.
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