In accordance with a request from a portable telephone 60, a sound data delivering server 20 delivers a trial-listening music data to the portable telephone without charging a fee to a user of the portable telephone, or delivers a regular music data to the portable telephone upon charging a fee to the...http://www.google.com/patents/US20010049641?utm_source=gb-gplus-sharePatent US20010049641 - Sound data delivering system, sound data delivery method, delivering server utilized in the sound data delivering system, client-side terminal utilized in the sound data delivering system, and computer-readable recording medium containing a program applied to a computer utilized in the sound data delivering system
