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User Operation Controls

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User operation controls (UOPs) are markers on a disc that DVD authors can insert anywhere to restrict a user's navigation options. Most discs follow standard UOP restrictions. For example, most discs do not allow the viewer to fast forward or show a menu while in First Play domain. In principle, each disc can insert any UOP command at any point on the disc, even if the command would otherwise be valid within the current domain. For example, a disc may be authored to disallow fast forwarding in a certain title or to prevent a particular menu from being shown after the user enters the title domain. The DVD Navigator complies with all such commands from the disc and does not allow an application to override the disc's UOP controls.

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