초록 ▼

A system for tracking usage of digital content on user devices. Electronic stores coupled to a network sell licenses to play digital content data to users. Content players, which receive from the network the licensed content data, are used to play the licensed content data. Additionally, a logging s

A system for tracking usage of digital content on user devices. Electronic stores coupled to a network sell licenses to play digital content data to users. Content players, which receive from the network the licensed content data, are used to play the licensed content data. Additionally, a logging site that is coupled to the network tracks the playing of the content data. In particular, the logging site receives play information from the network, and the play information includes the number of times that the content data has been played by the associated content player. Also provided is a method for tracking usage of digital content on user devices. According to the method, a license to play digital content data is sold to a user, and the licensed content data is transmitted to a content player for the user. Further, information is transmitted to a logging site whenever the content data is played by the content player or copied from the content player to an external medium so that usage of the licensed content data can be tracked.

대표청구항 ▼

1. A method of playing digital content data on a user's system, the content data being compressed and encrypted with a first encrypting key, said method comprising the steps of:generating the first encrypting key and corresponding first decrypting key on the user's system; encrypting the first decry

1. A method of playing digital content data on a user's system, the content data being compressed and encrypted with a first encrypting key, said method comprising the steps of:generating the first encrypting key and corresponding first decrypting key on the user's system; encrypting the first decrypting key to produce an encrypted first decrypting key that is stored on the user's system; decrypting the encrypted first decrypting key using a second decrypting key; decrypting at least part of the content data with the first decrypting key to produce decrypted content data; decompressing the decrypted content data to produce decompressed content data; and playing or recording the decompressed content data, wherein the second decrypting key is a secret user key that is hidden on the user's system.