System, method, and device for playing back recorded audio, video or other content from non-volatile memory cards, compact disks or other media

Abstract

A secure software system for a portable device or computer that provides a simple interface to the device or computer and that retrieves and dynamically decrypts keys and content from a secure media while minimizing exposure of the keys and eliminating the need for manufacturers of the device or computer to create a their own system to manage these complex processes.

Description

BACKGROUND [0001] 1. Field of the invention [0002] This invention relates generally and specifically to secure playback of digital audio, video or other content from memory cards, compacts disks or other media. [0003] 2. Related art [0004] The potential of electronic distribution of copyrighted music over the Internet, by other communication systems or through retail kiosks, is being limited by concerns about unauthorized copying of the music. This is also the case for other audio, as well as video, content. The content is typically provided to the ultimate customer in encrypted form, and the customer records the encrypted content files onto some storage media, such as a personal computer memory, a memory of a portable playing device, a writable compact disk (CD) or a non-volatile memory card. Providers of the content would like to eliminate the possibility of unauthorized copying of the content but have to be satisfied with taking steps that minimize the amount of copying that occu...

AI Technical Summary

Benefits of technology

The solution effectively prevents unauthorized copying by ensuring that only small portions of content are decrypted, and keys are dynamically generated and deleted, providing robust protection for encrypted content across different devices and media types.

Problems solved by technology

Encrypted content is difficult to access, and memory cards or compact disks with encrypted content each have specific structures that require specific commands and routines to access encrypted and unencrypted content.

The software utilizes and requires only a small buffer for encryption purposes and is descigned to run efficiently even in environments with limited processing power and memory.

Additionally, computationally demanding portions of the software, such as the encryption and decryption (security) engine may be executed by the DSP while other portions of the software may be executed by a another microprocessor or an ASIC.

The encryption and decryption takes place in an isolated module that is very difficult to access and thus isolated from any attempts from unauthorized persons wishing to access encryption keys in order to copy the files from the media or the device.

Images