Analog Protection System A Presentation to the Analog Reconversion Discussion Group March 5, 2003 Analog Protection System A Presentation to the Analog.

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Presentation transcript:

Analog Protection System A Presentation to the Analog Reconversion Discussion Group March 5, 2003 Analog Protection System A Presentation to the Analog Reconversion Discussion Group March 5, 2003

© 1999 CHASE HQ - Company May 11, p 2 What is the Macrovision Analog Protection System?  A way of signaling that a video signal is protected Allows restriction on copying and redistribution  A method of forcing copies to be degraded or inhibited when copies are made of video signals containing the Macrovision signals AGC (Automatic Gain Control) process Color Stripe process –2-line Color Stripe –4-line Color Stripe Controlled to provide: –AGC [Trigger bits = 1] –AGC + 2-stripe [Trigger bits = 2] –AGC + 4-stripe [Trigger bits = 3]  A way of signaling that a video signal is protected Allows restriction on copying and redistribution  A method of forcing copies to be degraded or inhibited when copies are made of video signals containing the Macrovision signals AGC (Automatic Gain Control) process Color Stripe process –2-line Color Stripe –4-line Color Stripe Controlled to provide: –AGC [Trigger bits = 1] –AGC + 2-stripe [Trigger bits = 2] –AGC + 4-stripe [Trigger bits = 3]

© 1999 CHASE HQ - Company May 11, p 3 How does AGC Work?  Pulses added to analog video signals designed to: Signal that a video work is copyrighted and shouldn’t be copied –DV-CAM, consumer DVD recorders Negatively impact the AGC circuit of recording devices  Pulses added to analog video signals designed to: Signal that a video work is copyrighted and shouldn’t be copied –DV-CAM, consumer DVD recorders Negatively impact the AGC circuit of recording devices

© 1999 CHASE HQ - Company May 11, p 4 How does ColorStripe Work?  Variations in the color subcarrier of a composite analog video signal to disturb the sub-carrier circuit of analog VCRs  Not removed in black boxes  Variations in the color subcarrier of a composite analog video signal to disturb the sub-carrier circuit of analog VCRs  Not removed in black boxes

© 1999 CHASE HQ - Company May 11, p 5 How is the Analog Protection System Activated?  Digital Devices Alterations to the analog video signal are made in a chip that converts the digital video to analog within a consumer’s equipment DVD Players –Trigger bits are added during DVD authoring to indicate that APS should be applied to DVD players analog outputs or consumer analog video outputs on a PC while playing back a protected DVD-Video disc. Set Top Boxes – Trigger bits are incorporated into Conditional Access Entitlement Control Messages (ECM) in the stream delivered to a consumer’s STB.  VHS Alterations to the analog video signal are added in a Macrovision-provided “processor box” used by duplicators.  Digital Devices Alterations to the analog video signal are made in a chip that converts the digital video to analog within a consumer’s equipment DVD Players –Trigger bits are added during DVD authoring to indicate that APS should be applied to DVD players analog outputs or consumer analog video outputs on a PC while playing back a protected DVD-Video disc. Set Top Boxes – Trigger bits are incorporated into Conditional Access Entitlement Control Messages (ECM) in the stream delivered to a consumer’s STB.  VHS Alterations to the analog video signal are added in a Macrovision-provided “processor box” used by duplicators.

© 1999 CHASE HQ - Company May 11, p 6 Why is Macrovision’s APS Relevant to ARDG in Digital Devices?  Record Control Inhibit recording of video that is sourced from DVD, or STBs (effectively “Copy Never”)  Re-encode of APS PVRs detect APS at input, calculate APS trigger bits, and re- encode on analog outputs –Maintains effectiveness in inhibiting copies to removable media. –Alternatively, some PVRs inhibit storage to hard disk  Redistribution Control Some PVRs detect APS at input and restrict release of content to unprotected network connections  Record Control Inhibit recording of video that is sourced from DVD, or STBs (effectively “Copy Never”)  Re-encode of APS PVRs detect APS at input, calculate APS trigger bits, and re- encode on analog outputs –Maintains effectiveness in inhibiting copies to removable media. –Alternatively, some PVRs inhibit storage to hard disk  Redistribution Control Some PVRs detect APS at input and restrict release of content to unprotected network connections

© 1999 CHASE HQ - Company May 11, p 7 System Overview - Record Control with APS DVD Player VCR Other Digital Source DVD RAM, D-VHS Or Other Digital Recorder No Copy Permitted Low-Cost APS Detector integrated in Chip Cable Satellite Program Source Consumer’s Home PC Low-Cost APS Detector integrated in Chip on Video Capture board Analog Video With APS STB

© 1999 CHASE HQ - Company May 11, p 8 System Overview – Detect and Re-encode DVD Player VCR / Digital recorder Other Digital Source Personal Video Recorder Low-Cost APS Detector integrated in Chip Cable Satellite Program Source Consumer’s Home Analog Video With APS Analog Video With APS Low-Cost APS Encoder integrated in Chip VCR STB No Copy Permitted

© 1999 CHASE HQ - Company May 11, p 9 System Overview - Redistribution Control with APS DVD Player VCR Other Digital Source Personal Digital Recorder Low-Cost APS Detector Integrated in Chip Cable Satellite Program Source Consumer’s Home PC Low-Cost APS Detector Integrated in Chip Analog Video With APS Protected Digital Video Internet STB

© 1999 CHASE HQ - Company May 11, p 10 Relationship between APS and Watermarking  Macrovision APS Impacts recordings made by variety of recorders Widely implemented Circumvention easier then with watermarking  Video Watermarking Provides for “Copy One Generation” No effect on non-compliant devices –But survives transmission through non-compliant devices Playback control impacts compliant players when copy made using non-compliant recorder Additional layer of security when deCSS hack employed  APS & Watermarking are Complementary Impact different device populations Feature set is different As fundamentally different technologies, require distinct and different skills and tools to circumvent –Increases cost and complexity to circumvent both  Macrovision APS Impacts recordings made by variety of recorders Widely implemented Circumvention easier then with watermarking  Video Watermarking Provides for “Copy One Generation” No effect on non-compliant devices –But survives transmission through non-compliant devices Playback control impacts compliant players when copy made using non-compliant recorder Additional layer of security when deCSS hack employed  APS & Watermarking are Complementary Impact different device populations Feature set is different As fundamentally different technologies, require distinct and different skills and tools to circumvent –Increases cost and complexity to circumvent both

© 1999 CHASE HQ - Company May 11, p 11 Conclusion  APS solves many ARDG problems  APS has well established infrastructure Licenses Chips Authoring tools Transmission tools Technical support  Only technology universally implemented today  APS solves many ARDG problems  APS has well established infrastructure Licenses Chips Authoring tools Transmission tools Technical support  Only technology universally implemented today