The 5Rs
         Ideally, OER provides all 5 of these values. 
        
            - Retain: Users have the right to make, archive, and "own" copies of the content;
 
            - Reuse:  Content can be reused in its unaltered form;
 
            - Revise: Content can be adapted, adjusted, modified or altered;
 
            - 
                Remix: The original or revised content can be combined with other content to create something new;
            
 
            - 
                Redistribute: Copies of the content can be shared with others in its original, revised or remixed form.
            
 
        
            
         
         Retention can have a suprisingly strong effect, especially for students who normally can not markup and retain their text from year to year.