DVD Studio Pro: UOPs (User Operation Controls) Described

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 DVDs do not allow the viewer to fast forward or show a menu while in First Play domain (during the FBI copyright warning on Region 1 discs, for example).

In principle, a DVD author can insert any UOP command at any point on the disc. Then 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.

In DVD Studio Pro, when you have a track or marker selected (use the Tutorial to see this), the Property Inspector contains a User Operations provision under the General section. Using this provision allows you to set the User Operations value to "Allowed" or "Denied".