libdvdcss

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.

libdvdcss[1]
Developer(s)VideoLAN
Stable release
1.4.2 / March 23, 2018 (2018-03-23)[2]
Repository
Written inC
Operating systemLinux, BSD, BeOS
Windows 95 and later
Mac OS X, Solaris, HP-UX
PlatformPortable
TypeLibrary
LicenseGNU GPL v2[3]
Websitewww.videolan.org/developers/libdvdcss.html

Comparison with DeCSS

libdvdcss is not to be confused with DeCSS. Whereas DeCSS uses a cracked DVD player key to perform authentication, libdvdcss uses a generated list of possible player keys. If none of them work (for instance, when the DVD drive enforces region coding), libdvdcss then performs a brute-force attack, ignoring the DVD's region code (if any). The legal status of libdvdcss is controversial[4] but there has been—unlike DeCSS—no known legal challenge to it as of May 2018.

Distribution

Many Linux distributions do not contain libdvdcss (for example, Debian, Ubuntu, Fedora and openSUSE) due to fears of running afoul of DMCA-style laws, but they often provide the tools to let the user install it themselves. For example, it used to be available in Ubuntu through Medibuntu, which is no longer available.[5]

Distributions which come pre-installed with libdvdcss include BackTrack, CrunchBang Linux, LinuxMCE, Linux Mint, PCLinuxOS, Puppy Linux 4.2.1, Slax, Super OS, Pardus, and XBMC Live.

Usage

Libdvdcss alone is only a library and cannot play DVDs. DVD player applications, such as VLC media player, use this library to decode DVDs. Libdvdcss is optional in many open-source DVD players, but without it, only non-encrypted discs will play.

Using HandBrake for DVD ripping on macOS requires that one install libdvdcss (with compilation[6] or Homebrew)

gollark: I think they just have a function to get the next thing on each end.
gollark: FEAR algorithms I guess.
gollark: Wow! My phone autocompleted magnetohydrodynamics.
gollark: Relativistic quantum magnetohydrodynamics.
gollark: Using stochastic breath first search.

References
  1. "libdvdcss - VideoLAN". www.videolan.org.
  2. "Index of /pub/libdvdcss/1.4.2/". download.videolan.org.
  3. "Public license". code.videolan.org. Retrieved 2020-05-09.
  4. "Frequently Asked Questions - VideoLAN Wiki". wiki.videolan.org. Retrieved 2019-06-14.
  5. Many Debian derivatives provide a script in /usr/share/doc/libdvdread4/install-css.sh
  6. VideoLAN Project (2018-06-14). "libdvdcss Mac 1.4.2 - Download". Mac.softpedia.com. Retrieved 2020-05-09.
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