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System or technology used to place limitations (access to or copying of) onto digital content (eBooks, music, etc.). A publisher or author of an eBook, not the retailer, determines the level of restrictions applied to an eBook. This includes how many times an eBook can be downloaded for a single purchase, and the number of devices (computers, eBook readers, etc.) to which the eBook can be transferred.

See Also: How to publish an eBook