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US 7877330

How to Buy Digital Media Once and Get Multiple Formats

A system that lets you pay for a digital file once and download it in different formats from various providers without paying again.

Statusactive

Granted2011

Expires2029

Claims24

Forward citations12

Prior art31

AssigneeAmazon Technologies Inc

InventorsCharles Gordon, Hilliard B. Siegel

Patent B

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