A computer implemented 
online music distribution system provides for the secure delivery of audio data and related media, including text and images, over a public communications network. The 
online music distribution system provides security through multiple 
layers of 
encryption, and the cryptographic binding of purchased audio data to each specific purchaser. The 
online music distribution system also provides for previewing of audio data prior to purchase. In one embodiment, the online music distribution 
system is a 
client-
server system including a content manager, a delivery 
server, and an HTTP 
server, communicating with a 
client system including a 
Web browser and a media player. The content manager provides for management of media and audio content, and 
processing of purchase requests. The delivery server provides delivery of the purchased media data. The 
Web browser and HTTP server provide a communications interface over the 
public network between the content manager and media players. The media player provides for 
encryption of user personal information, and for decryption and playback of purchased media data. Security of purchased media data is enhanced in part by the use of a personal, digital passport in each media player. The digital passport contains identifying information that identifies the purchaser, along with confidential information, such as 
credit card number, and 
encryption data, such as the media player's public and private keys. The media player encryption data is used to encrypt purchased media data, which is decrypted in real time by the media player. The media player also displays confidential information, such as the purchaser's 
credit card number, during playback.