The term "open content" describes any copyrightable work (traditionally excluding software, which is described by other terms like "open source") that is licensed in a manner that provides users with free and perpetual permission to engage in the 5R activities: 1. Retain - the right to make, own, and control copies of the content (e.g., download, duplicate, store, and manage). 2. Reuse - the right to use the content in a wide range of ways (e.g., in a class, in a study group, on a website, in a video). 3. Revise - the right to adapt, adjust, modify, or alter the content itself (e.g., translate the content into another language). 4. Remix - the right to combine the original or revised content with other open content to create something new (e.g., incorporate the content into a mashup).