What are the copy protection issues?
CPSA (content protection system architecture) is the name given to the overall framework for security and access control across the entire DVD family. Developed by the “4C” entity (Intel, IBM, Matsushita, and Toshiba) in cooperation with the Copy Protection Technical Working Group (CPTWG), it covers encryption, watermarking, protection of analog and digital outputs, and so on. There are six forms of content protection that apply to DVD. 1) Analog CPS (Macrovision) Videotape (analog) copying is prevented with a Macrovision 7.0 or similar circuit in every player. The general term is APS (Analog Protection System), also sometimes called copyguard. Computer video cards with composite or s-video (Y/C) output must also use APS. Macrovision adds a rapidly modulated colorburst signal (“Colorstripe”) along with pulses in the vertical blanking signal (“AGC”) to the composite video and s-video outputs.
There are already two forms of copy protection specified by the DVD standard: 1) Videotape (analog) copying is prevented with a Macrovision (or equivalent) circuit in every player. Composite video output will have a rapidly modulated colorburst signal along with pulses in the vertical blanking signal to confuse the automatic-recording-level circuitry of VCRs. Unfortunately, this can degrade the picture, especially with old or nonstandard equipment. There are rumors that Macrovision can create problems for some line doublers. [Can anyone confirm this?] It’s not clear if Macrovision will be used on component video output or S-video output. The discs themselves tell the player whether or not to enable Macrovision. So just as with videotapes now, some DVDs will be Macrovision-protected and some wont. 2) Digital copying is controlled by information on each disc specifying how many times (if any) the data can be copied.
There are four forms of copy protection used by DVD: 1) Analog CPS (Macrovision) Videotape (analog) copying is prevented with a Macrovision 7.0 or similar circuit in every player. The general term is APS (Analog Protection System). Computer video cards with composite or s-video (Y/C) output must also use APS. Macrovision adds a rapidly modulated colorburst signal (“Colorstripe”) along with pulses in the vertical blanking signal (“AGC”) to the composite video and s-video outputs. This confuses the synchronization and automatic-recording-level circuitry in 95% of consumer VCRs. Unfortunately, it can degrade the picture, especially with old or nonstandard equipment. Macrovision may show up as stripes of color, distortion, rolling, black & white picture, and dark/light cycling. Macrovision creates severe problems for most line doublers. Macrovision is not present on analog component video output of early players, but is required on newer players (AGC only, since there is no burst in a comp
There are two forms of copy protection specified by the DVD standard: * 1. Analog copying (from disc to tape) is prevented with a Macrovision circuit in every player, this will confuse the automatic-recording-level circuitry of VCRs. * 2. Digital copying is controlled by information on each disc specifying how many times (if any) the data can be copied. This is a “serial’ copy management scheme designed to prevent copies of copies. The accepted solution is based on encryption of the film content of the disc. Thisbasically means that a specific decryption technology is required inthe player to deliver an undisturbed clear picture. Philips is pleased that there is an agreement now between all the different industries on copy protection. This was the last open issue with respect to the DVD-Video format. We can go ahead now with our introduction plans.
CPSA (content protection system architecture) is the name given to the overall framework for security and access control across the entire DVD family. Developed by the “4C” entity (Intel, IBM, Matsushita, and Toshiba) in cooperation with the Copy Protection Technical Working Group (CPTWG), it covers encryption, watermarking, protection of analog and digital outputs, and so on. There are many forms of content protection that apply to DVD. 1) Analog CPS (Macrovision) Videotape (analog) copying is prevented with a Macrovision 7.0 or similar circuit in every player. Macrovision may show up as stripes of color, distortion, rolling, black & white picture, and dark/light cycling. Macrovision creates problems for most TV/VCR combos (see 3.2.1) and some high-end equipment such as line doublers and video projectors. The general term for a system that prevents taping is APS (Analog Protection System), also sometimes called copyguard. Computer video cards with composite or s-video (Y/C) output mus
