I can see where having to sign in with a username and password would be helpful, but for me all that's necessary is to lock certain content from being visible to others. Most of my media I would like to have available to whomever is using the program (primarily in theater view), but it would be nice to have an additional namable media button (i.e. Audio, Video, TV, Weather, News, Other) that when selected would prompt the user to enter a password. It's already possible to assign which media types to lock by category (genre = home video, for example). If one could set up multiple access control filters, each with their own password (or common password) it might serve my purpose as well as Benn's? Maybe also an option to include a access control button in theater view for each? Probably easier said than done, but I think something along these lines would greatly enhance the access control feature practicallity and usability.