What is the difference between "free" and "open" resources?


Open Educational Resources (OER) are and will always be free resources (in digital formats); however, not all freely available resources are OER. Free resources may be only temporarily available free of charge and may be restricted from access or use at some time in the future (including through the application of fees). Moreover, resources that are merely “free” (and not OER) may not be modified, adapted, or redistributed without obtaining the express permission of the copyright holder. Finally, it ought to be noted that in some cases (e.g., open textbooks in print format) OER may not be freely available. (Source)

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