Abstract: A system that enables digital distribution of copyrighted sheet music—and allows musician to view the copyrighted sheet music on personal computing devices—while preventing the unauthorized distribution of copyrighted sheet music. An electronic commerce platform provides functionality to purchase copies of copyrighted sheet music. A network security module provides login credentials for purchasers and musicians (and, in some embodiments, limits the number of simultaneous logins). A graphical user interface provides functionality for each purchaser to distribute each purchased copy to one—and only one—musician. In some embodiments, the system allows purchasers to recall sheet music distributed to a first musician and distribute the recalled sheet music to a second musician (without providing functionality for the first musician to view the recalled sheet music).