Abstract: A method and system for delivering and securing computer game content via the Internet provides a customized interface from which an end-user may purchase episodic game content wherein game content is secured to the user's computer. A computer game interface lists game episodes that are installed on the end-user's computer, as well as episodes that are available that have not been purchased by the end-user. The episodes that are installed may be started from the interface and episodes that are not installed may be purchased through the interface. Upon purchase of the game, a security mechanism communicates information that uniquely identifies the end-user's computer to a server that then customizes the software before transmitting it to the end-user's computer. The customization provides protection for game software publishers from unauthorized copying and use of the game content.