| 摘要 |
<p>A system (10) for distributing and playing electronic media includes a service facility (11) having electronically accessible a library (30, 32) and catalog (35) of data files (33). The system can set up customer accounts, process payments from customers for establishing file access authorizations, and transmit user-selected files to customers. The system also provides a player program (42) to each customer for metering access to received data files as limited by the authorization, the selected files being accessed for further processing of orders from the customer while the authorization remains established. The system can encrypt the data files and the player program, and can decrypt the received data files onyl while the authorization remains established. Authorization can be independent of files selected and/or played, for a period of time that is measured only during playing or for a collective number of plays which can be counted only after a threshold period of time of playing each file.</p> |
