When shopping in OverDrive Marketplace, I see abbreviations like OC/OU and MA. What do these mean?

A breakdown of lending model ownership and availability will show for all titles as you browse and search the catalog or view titles in carts. Here’s a key of the abbreviations in use for each lending model:

• OC/OU = One copy/one user
• MA = Metered access
• SU = Simultaneous use