libdvdcss is a simple library designed for accessing DVDs like a block device without having to bother about the decryption. The important features are:
- portability: currently supported platforms are GNU/Linux, FreeBSD, NetBSD, OpenBSD, BeOS, Windows 98/ME, Windows NT/2000/XP, Mac OS X, Solaris, HP-UX and OS/2.
- adaptability: unlike most similar projects, libdvdcss doesn't require the region of your drive to be set and will try its best to read from the disc even in the case of a region mismatch.
- simplicity: a DVD player can be built around the libdvdcss API using no more than 4 or 5 library calls.
Developed by the VideoLAN Project, libdvdcss is a library that can be used to read DVDs without having to deal with decryption. At the same time, the library is also able to read discs that have a different region than your drive which is a must if you want to use Handbrake in order to rip a DVDs using your Mac. On the resulting page, click on libdvdcss.pkg to download it. Double-click on the resulting file. In the resulting install window, click continue to begin the process, make sure to select your hard drive as the install location, and continue to click continue until the install process is finished. Free download this best DVD ripper. Portability: currently supported platforms are GNU/Linux, FreeBSD, NetBSD, OpenBSD, BeOS, Windows 98/ME, Windows NT/2000/XP, Mac OS X, Solaris, HP-UX and OS/2. Adaptability: unlike most similar projects, libdvdcss doesn't require the region of your drive to be set and will try its best to read from the disc even in the case of a region mismatch.
libdvdcss is free software, released under the General Public License. This ensures that libdvdcss remains free and used only with free software.
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The complete libdvdcss programming interface is documented in the dvdcss.h file.
Some environment variables can be used to change the behavior of libdvdcss without having to modify the program which uses it. These variables are:
- DVDCSS_VERBOSE: sets the verbosity level.
0
outputs no messages at all.1
outputs error messages to stderr.2
outputs error messages and debug messages to stderr.
- DVDCSS_METHOD: sets the authentication and decryption method that libdvdcss will use to read scrambled discs. Can be one of
title
,key
ordisc
.key
is the default method. libdvdcss will use a set of calculated player keys to try and get the disc key. This can fail if the drive does not recognize any of the player keys.disc
is a fallback method whenkey
has failed. Instead of using player keys, libdvdcss will crack the disc key using a brute force algorithm. This process is CPU intensive and requires 64 MB of memory to store temporary data.title
is the fallback when all other methods have failed. It does not rely on a key exchange with the DVD drive, but rather uses a crypto attack to guess the title key. On rare cases this may fail because there is not enough encrypted data on the disc to perform a statistical attack, but in the other hand it is the only way to decrypt a DVD stored on a hard disc, or a DVD with the wrong region on an RPC2 drive.
- DVDCSS_RAW_DEVICE: specify the raw device to use. Exact usage will depend on your operating system, the Linux utility to set up raw devices is
raw(8)
for instance. Please note that on most operating systems, using a raw device requires highly aligned buffers: Linux requires a 2048 bytes alignment (which is the size of a DVD sector).
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- DVDCSS_CACHE: specify a directory in which to store title key values. This will speed up descrambling of DVDs which are in the cache. The DVDCSS_CACHE directory is created if it does not exist, and a subdirectory is created named after the DVD's title or manufacturing date. If DVDCSS_CACHE is not set or is empty, libdvdcss will use the default value which is '${HOME}/.dvdcss/' under Unix and 'C:Documents and Settings$USERApplication Datadvdcss' under Win32. The special value 'off' disables caching.