6cdd3854__Short_History_of_Usage_Rights__XrML_2_0
[MPEG-21] Enhance [RDD Definition] To Derive a new Resource which is larger than its Source. With Enhance, two distinct Resources will exist at the end of the process, one of which is the original Resource in unchanged form, and one of which is newly made, whose content is Adapted from the original Resource, and a Measure of which is larger than that of the original while no Measures of it are smaller. Changes can include the addition of elements to the original Resource, including the Embedding of other Resources. Changes can be made temporarily to the original Resource in the course of the Enhance process, but such changes are not saved in the original Resource at the end of the process. [XrML 2.0] 
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XrML - A Short History of Usage Rights
XrML 2.0