| 摘要 |
Techniques of transferring digital data, such as that of music, over a communications network, such as the Internet, wherein an identification code supplied by the recipient or the recipient's utilization device, such as a computer or a device that utilizes the data, to the data provider is used to encrypt the data and send it to the recipient. A utilization device of the recipient, such as a music player, then decrypts the data by use of either the same identification code as a key or another key that is related to the identification code. The decryption key is not accessible by the recipient or the recipient's computer or utilization device in an unencrypted form. Access to the transferred data in an unencrypted form is prevented in order to prevent unauthorized copying and distribution of the data. Copies of the encrypted data file and the decryption key may be made for the recipient's use on multiple utilization devices without risking mass unauthorized copying and distribution. |
