Abstract: Key-limited use applications are maintained at a central service where the central service can receive requests from a remote computing device for access to the key-limited use applications. The key-limited use applications include publicly available portions and a locked portions accessible with a key. The central service can provide a key to the remote computing device associated with a key-limited use application for complete access. The key can be stored in a memory device associated with the remote computing device. A digital signature can be assigned to the key to prevent operation of the key in a second computing device. Unauthorized or unlicensed computing devices are prevented from using the applications.

Abstract: A game or other software program is made accessible for execution by clients on a peer-peer network only after a plurality of verifications are made to ensure that control of the software is maintained. With a request sent to a server to access the software, a client includes a nonce and an ID of the user. The server digitally signs a portion of a ticket that is returned to the client, which includes the nonce, a time stamp, and the ID. The ticket is required to access the software. The clients are required to exchange the tickets, verify the digital signature on the portion of each ticket, and use the information therein to confirm that the tickets are current, issued by the correct server, issued to the proper users, and received from the users who are intended to execute the software.

Abstract: A personalized web page displays a subset of multiplayer games available on a game web site, corresponding to game software programs that are installed on a user's computer. When the user connects to the web site, an extended markup language (XML) data file, a web page that is not yet personalized, and a control file are downloaded. An executable instance of an ActiveX™ control program instantiated by JScript included in the web page queries the operating system registry to produce an XML text string listing each software program of a specific type that are installed. The results are then compared to the XML data downloaded from the web site, returning the subset of the games that are available on the web site and also installed on the computer. The web page is then transformed to display the subset, producing the personalized web page.