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ARTICLES IN THE BOOK

  1. Architecture of Windows NT
  2. AutoPlay
  3. Bill Gates
  4. BitLocker Drive Encryption
  5. Calibri
  6. Cambria
  7. Candara
  8. Chess Titans
  9. ClearType
  10. Consolas
  11. Constantia
  12. Control Panel
  13. Corbel
  14. Criticism of Windows Vista
  15. Dashboard
  16. Desktop Window Manager
  17. Development of Windows Vista
  18. Digital locker
  19. Digital rights management
  20. Extensible Application Markup Language
  21. Features new to Windows Vista
  22. Graphical user interface
  23. Group Shot
  24. ImageX
  25. INI file
  26. Internet Explorer
  27. Internet Information Services
  28. Kernel Transaction Manager
  29. List of Microsoft software codenames
  30. List of Microsoft Windows components
  31. List of WPF applications
  32. Luna
  33. Mahjong Titans
  34. Meiryo
  35. Microsoft Assistance Markup Language
  36. Microsoft Expression Blend
  37. Microsoft Expression Design
  38. Microsoft Gadgets
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  40. Microsoft Virtual PC
  41. Microsoft Visual Studio
  42. Microsoft Windows
  43. Microsoft Windows Services for UNIX
  44. MS-DOS
  45. MSN
  46. MUI
  47. Object manager
  48. Operating system
  49. Original Equipment Manufacturer
  50. Outlook Express
  51. Peer Name Resolution Protocol
  52. Protected Video Path
  53. Purble Place
  54. ReadyBoost
  55. Recovery Console
  56. Remote Desktop Protocol
  57. Security and safety features of Windows Vista
  58. Segoe UI
  59. User Account Control
  60. WIM image format
  61. Windows Aero
  62. Windows Anytime Upgrade
  63. Windows Calendar
  64. Windows CE
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  66. Windows Disk Defragmenter
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  84. Windows Presentation Foundation
  85. Windows Registry
  86. Windows Rights Management Services
  87. Windows Security Center
  88. Windows Server Longhorn
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  90. Windows SharePoint Services
  91. Windows Shell
  92. Windows Sidebar
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  94. Windows System Assessment Tool
  95. Windows System Recovery
  96. Windows Update
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  98. Windows Vista
  99. Windows Vista editions and pricing
  100. Windows Vista Startup Process
  101. Windows Workflow Foundation
  102. Windows XP
  103. Windows XP Media Center Edition
  104. XML Paper Specification
  105. Yahoo Widget Engine
 



A GUIDE TO WINDOWS VISTA
This article is from:
http://en.wikipedia.org/wiki/Protected_Video_Path

All text is available under the terms of the GNU Free Documentation License: http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License 

Protected Media Path

From Wikipedia, the free encyclopedia

(Redirected from Protected Video Path)

The Protected Media Path is a set of technologies creating a "Protected Environment", first included in Microsoft's Windows Vista operating system, that are used to enforce digital rights management (or DRM) protections on content. Its subsets are Protected Video Path (PVP) and Protected User Mode Audio (PUMA).

Overview

The Protected Environment in which DRM content is played contains the media components that play DRM content, so the application only needs to provide remote control (Play, Rewind, Pause, and so on), rather than having to handle unprotected content data. The Protected Environment also provides all the necessary support for Microsoft-approved ("signed") third-party software modules to be added. It provides a “wall” against outside copying, where within the walls, content can be processed without making the content available to unapproved software.

In order to prevent users from copying DRM content, Windows Vista provides process isolation and continually monitors what kernel-mode software is loaded. If an unverified component is detected, then Vista will stop playing DRM content, rather than risk having the content copied. The Protected Environment is implemented completely in software, so software-based attacks such as patching the Windows kernel are possible.

These restrictions concern the various outputs from the PC. For DRM content, digital outputs such as Digital Visual Interface (DVI) and High-Definition Multimedia Interface (HDMI) will have High-bandwidth Digital Content Protection (HDCP) enabled, to prevent someone recording the digital stream. Even analog TV-style outputs typically need protection, as provided by mechanisms such as Macrovision and CGMS-A. These restrictions only apply to DRM protected content, such as HD DVD or Blu-ray that are protected with AACS, and also apply in Windows XP using supported playback applications[1] [2]. User's standard unprotected content will not be faced with these restrictions. Some output types such as S/PDIF (Sony/Philips Digital Interchange Format) typically don’t have a suitable protection scheme available, so these need to be reliably turned off if the content so specifies.

In Vista, the robust control of PC video outputs is provided by PVP-OPM, which is essentially the next generation of Certified Output Protection Protocol (COPP) introduced in Windows XP. However, rather than being a software application programming interface, PVP-OPM operates with the Windows media components in the Protected Environment.

Additionally, PVP-UAB (Protected Video Path - User-Accessible Bus) is used to encrypt video and audio data as it passes over the PCI-Express bus, to prevent it from being intercepted and copied on the way to the graphics card. It is complementary to PVP Output Protection Management.

Hacked?

During January 2007, the kernel developer for the ReactOS, Alex Ionescu, announced that he had found a method that allows end users to bypass Vista’s Protected Media Path. This would allow digital content to be played on equipment that does not implement DRM security measures (like rescaling of video resolutions and disabling analog audio outputs). However, he did not release any sourcecode for fear of a Microsoft lawsuit with regards to a possible violation of the DMCA.[3] On March 6th 2007, Microsoft responded after internal testing, that the described method would not work. [4]

See also

  • Features new to Windows Vista
  • Vista IO technologies

References

  • http://www.microsoft.com/whdc/device/stream/output_protect.mspx
  • http://msdn2.microsoft.com/en-gb/library/aa376846.aspx
Retrieved from "http://en.wikipedia.org/wiki/Protected_Media_Path"