Method and system for secure distribution and utilization of data over a network

1. A method of securely utilizing downloaded data comprising:

opening a media player on a client computing device;

opening a data file on the client;

requesting a portable token from and used by the client, the portable token being a physical device removeably coupleable to the client;

reading a distinguishing number from the token;

verifying a digital message linking the data file to the token using the media player, the distinguishing number, and a private key in the token, wherein verification of the digital message is required to access data in the data file.

2. The method of claim 1 , wherein in verifying the digital message, the media player reads the private key from the token to decrypt the digital message.

3. The method of claim 1 , wherein in verifying the digital message, the media player sends the digital message to the token.

4. The method of claim 3 , wherein the token decrypts an encrypted symmetric key using the private key.

5. The method of claim 1 , wherein verifying a digital signature comprises:

verifying the distinguishing number read from the token;

verifying a time period associated with the data file;

decrypting an, encrypted symmetrical key using the private key from the token;

decrypting the data file using the symmetrical key.

6. The method of claim 1 , wherein the distinguishing number is assigned to the token by a manufacturer.

7. The method of claim 6 , wherein the distinguishing number is permanently assigned to the token.