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Region-free players are DVD players shipped without the ability to enforce regional lockout (usually by means of a chip that ignores any region coding), or without this flag set. However, if the player is not region-free, it can often be unlocked with an unlock code entered via the remote control .
libdvdcss (or libdvdcss2 in some repositories) is a free and open-source software library for accessing and unscrambling DVDs encrypted with the Content Scramble System (CSS). libdvdcss is part of the VideoLAN project and is used by VLC media player and other DVD player software packages, such as Ogle, xine-based players, and MPlayer.
The DVD Copy Control Association (DVD CCA) is an organization primarily responsible for the copy protection of DVDs. The Content Scramble System (CSS) was devised for this purpose to make copyright infringement difficult, but also presents obstacles to some legitimate uses of the media.
Unlike DVD regions, Blu-ray regions are verified only by the player software, not by the computer system or the drive. The region code is stored in a file or the registry, and there are hacks to reset the region counter of the player software. In stand-alone players, the region code is part of the firmware.
A normal DVD player can only play region-coded discs designated for the player's own particular region. However, a code-free or region-free DVD player is capable of playing DVDs from any of the six regions around the world. The CSS license prohibits manufacturing of DVD players that are not set to a single region by default. While the same ...
In order to decrypt a DVD-Video, the player reads the disc-key-block and uses its player-key to decrypt the disc-key. Thereafter, the player reads the title-keys and decrypts them with the disc-key. A different title-key can be assigned for the Video Manager and for each Video Title Set. The title-keys are used to decrypt the encrypted Packs. [5]
Portable DVD players generally have connections for additional screens and a car lighter plug. Some PDPs had iPod docks, USB and SD card slots built in. Some can play videos in other formats such as MP4, DivX, either from CDs, flash memory cards or USB external hard disks, and some DVD players had a USB video recorder.
The DVD reader software inside the DVD player automatically generates chapters for parts of the DVD lacking navigation commands, allowing them to be fast-forwarded or skipped; pressing the menu button, even in these previously restricted sections, will cause a jump to the main menu. [citation needed]