| 摘要 |
A system and method of providing media files such as songs or video over a network includes a first and a second transaction, separated by distinct website visits. In the first transaction, a file provider receives a payment over a network link, selects a first codec is selected based on a type of network link, and downloads a first copy of a media file to a customer that is compressed with the first codec. The provider also promises to download during a second transaction an additional copy of the song. During that second transaction, that or another provider downloads the additional copy of the media file without receiving further payment from the customer. The additional copy is compressed with a second codec that optimizes for the link used in the second transaction. Preferably, the customer concludes with a smaller AAC+ file downloaded to a mobile station and a higher fidelity AAC LTP file downloaded to a PC.
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