Method for controlling medium playback

Abstract

A destructive-read memory is one that the process of reading the memory causes the contents of the memory to be destroyed. Such a memory may be used in devices that are intended to acquire data that may have associated usage restrictions, such as an expiration date, usage count limit, or data access fee for the acquired data. Typically, to enforce usage restrictions, and protect against theft, complex and often costly security techniques are applied to acquired data. With destructive-read memory, complex and costly security is not required for stored data. In one embodiment, a write-back mechanism, which may employ security, is responsible for enforcing usage restrictions. If the write-back mechanism determines continued access to acquired data is allowed, then it writes back the data as it is destructively read from the memory.

Description

technical field [0001] The present invention relates generally to distributing commercial products, and more particularly to using destructive read memory to provide restricted access to distributed commercial products without having to use cumbersome protective techniques to prevent Unexpected access to the product. Background technique [0002] There have been many recent advances in community file sharing technologies and the technologies required to digitally encode music data, audio and / or visual data. These advances allow people (or machines) to easily share and exchange such data, directly or indirectly through sharing services. Such sharing techniques can be used to help diffuse commercial and non-commercial data, such as music. An important problem hindering such proliferation is the difficulty in enforcing copyright and / or sharing policies for certain data. [0003] For example, one person may wish to "rent" a song or movie by allowing another person to download...

AI Technical Summary

Problems solved by technology

To achieve such constraints, expensive and complex security techniques are generally used to control the release of digital data

Such security technologies increase the cost of providing data to customers, increase the cost of the equipment that presents the data, and increase the chances of problems

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