DVD Player (formerly Apple DVD Player) is the default DVD player in OS X. It supports all the standard DVD features such as multiple audio, video & subtitle tracks as well as Dolby audio, DVD@ccessURLs and closed captions. In some instances, users can choose which VOB file to open. DVD Player will only install if there is a DVD drive attached to the computer at the time of the OS install (i.e., a bootabledisk image made on a computer with a CD-ROM instead of a DVD-ROM drive will not have DVD playback libraries installed). DVD Player is also fully compatible with DVDs authored by DVD Studio Pro and iDVD, including HD DVDs by DVD Studio Pro.
DVD Player complies with most copyright laws, and will thus enforce most restrictive measures of DVD technology, such as region-restrictive encodings and user-inhibited operations ("disabled actions"). It does this even when using an all-region DVD drive, leading users to use alternative software. It will even force Apple's Grab (screen-grabbing) program to cease functioning through the Finder interface until the DVD Player application is quit, effectively preventing the user from taking screen captures of visual DVD content. :)