Image Constraint Token
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The Image Constraint Token (ICT) is a protocol flag that can cause
Operation
When using an
The Image Constraint Token applies on a per disc basis, so that one movie title could have it enabled while another from a different studio could have it disabled. It impacts video only, and has no effect on audio signal quality. Discs with ICT enabled will (theoretically) have it marked on the outside of package, allowing consumers to see if the specific disc has the flag enabled.
Note that ICT in conjunction with HDCP is used to protect the display path over which the video data travels, not the actual data on the disc itself.[2]
Rationale
The use of ICT is an attempt to prevent individuals from creating unauthorized high-resolution copies of copyrighted content. Without content protection, users with the appropriate equipment could easily capture each and every frame of the film at its full resolution, effectively making a "perfect" copy. Although this danger is greatest for unsecured digital outputs, analog outputs also allow copies to be made, albeit with a potential for slightly reduced quality.
Some
References
- ^ "What is an Image Constraint Token? (with pictures)". EasyTechJunkie. Retrieved 2022-12-08.
- ^ "Image Constraint Token | Semantic Scholar". www.semanticscholar.org. Retrieved 2022-12-08.
See also
- Macrovision
- Broadcast flag
- Protected Video Path
- Selectable Output Control