Abstract: Disclosed are method, system and article of manufacture for restricting use of a digital item stored in a client computer by sending an instruction from a server computer via a network. The server computer is configured to hold accounts for a plurality of users, each of which of the plurality of users may access the server computer via respective client computers. The server computer receives an instruction from a second client computer, and the server computer sends a message to the first client computer that the digital item should be restricted based on an identification parameter—such as type of the first client computer, user identifier, authorization key, an internet address, time of day, day of week, or an expiration date—received from the first client computer, whereupon the first client computer disables, deletes or locks a file on the first client computer.