2a. The prohibition on the use of works that are marketed "primarily for performance or display as part of mediated instructional activities transmitted via digital networks" is clearly intended to protect the market for commercially available educational materials. For example, if specific materials are available through an online database, or marketed in a format that may be delivered for educational purposes through "digital" systems, the TEACH Act generally steers users to those sources, rather than allowing educators to digitize and upload their own copies.