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BD+ Prevent Unauthorized Copies and Playback of Blu-ray Discs.

BD+ has made bdplus necessary for those who wish to copy Blu-Ray movies to reinvest resources to break each new version of security code.

BD+ is a component of the Blu-ray Disc Digital Rights Management system. It was developed by Cryptography Research Inc. and is based on their Self-Protecting Digital Content concept. Its intent was to prevent unauthorized copies of Blu-ray discs and the playback of Blu-ray media using unauthorized devices.

While BD+ has not stemmed the flow of 'cracked' high definition content, it has made it necessary for those who wish to copy Blu-Ray movies to reinvest resources to break each new version of security code.

BD+ is effectively a virtual machine embedded in authorized players. It allows content providers to include executable programs on Blu-ray Discs.

Such programs can:
1. Examine the host environment, to see if the player has been tampered with. Every licensed playback device manufacturer must provide the BD+ licensing authority with memory footprints that identify their devices.
2. Verify that the player's keys have not been changed.
3. Execute native code, possibly to patch an otherwise insecure system.
4. Transform the audio and video output. Parts of the content will not be viewable without letting the BD+-program repair it.

If a playback device manufacturer finds that its devices have been hacked, it can potentially release BD+-code that detects and circumvents the vulnerability. These programs can then be included in all new disc releases.

Virtual machine

This program which can be found inside the BDSVM directory of a BD+ protected disc is called content code. The content code is executed on a virtual big endian DLX-like processor interfacing 4MB of memory. The processor supports 59 different instructions and a register set consisting of 32 general purpose registers and three special purpose registers for the instruction filter, the clock cycle counter and the program counter. The BD+ Virtual Machine applies memory protection by masking memory access addresses to prevent them from falling outside of the designated memory areas. The execution of content code starts at address 0x1000 relative to the beginning of the payload of the first block of the file 00001.svm (located inside the BDSVM directory).

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Related External Source

Blu-ray Disc - Blu-ray Disc (official abbreviation BD) is an optical disc storage medium designed to supersede the DVD format.

BD+ - Full BD+ Explanation on Wikipedia.

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