# 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.

- **Patent:** US 7877330
- **Original title:** Method and system for managing access to media files
- **Owner:** Amazon Technologies Inc
- **Granted:** 2011
- **Status:** Active
- **Times cited:** 12
- **Field:** consumer_electronics, software, ecommerce, telecommunications

## What it does

This patent describes a digital 'master key' system for media. When you buy a song or movie, the system records that you have rights to that content. It then sends an authorization signal to other content providers you didn't buy from directly. This signal tells those providers to let you download the same file in different formats—like MP3, FLAC, or different video resolutions—without you needing to pay for each version individually.

## What it does NOT cover

- Does not cover the actual conversion of file formats (transcoding).
- Does not cover systems where the same company handles both the purchase and the file delivery.
- Does not cover subscription-based access models where rights are time-limited.
- Does not cover physical media purchases (e.g., buying a DVD and getting a digital code).

## The clever bit

The innovation is the decoupling of the purchase transaction from the content delivery. By sending an authorization signal to a third-party provider, the system allows a central 'rights manager' to grant access across a distributed network of servers.

## Real-world examples

1. Cross-platform digital music lockers
2. Cloud-based media synchronization services
3. Universal digital media entitlement systems

## Why it matters

This patent was filed during the early transition from physical media to fragmented digital ecosystems. It aimed to solve the frustration of 'format lock-in,' where a user might own a song but couldn't play it on a specific device because the file format wasn't compatible. It represents an attempt to create a unified digital library across different service providers.

## Frequently asked questions

### What does How to Buy Digital Media Once and Get Multiple Formats cover?

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

### Who owns patent US 7877330?

Amazon Technologies Inc owns this patent, granted in 2011.

### When does this patent expire?

This patent is expected to expire on January 25, 2031, when the invention enters the public domain.

### What is patent US 7877330 cited by?

This patent has been cited by 12 later patents that build on its ideas.

### What problem does this patent solve?

This patent was filed during the early transition from physical media to fragmented digital ecosystems. It aimed to solve the frustration of 'format lock-in,' where a user might own a song but couldn't play it on a specific device because the file format wasn't compatible. It represents an attempt to create a unified digital library across different service providers.

### What does this patent NOT cover?

Does not cover the actual conversion of file formats (transcoding).

**Full plain-English explainer:** https://patentbrief.org/patent/us/7877330/kindle-e-reader

**Original patent:** https://patents.google.com/patent/US7877330

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._