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author | diego <diego@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2006-10-25 12:08:28 +0000 |
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committer | diego <diego@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2006-10-25 12:08:28 +0000 |
commit | a60574bcbba76c781605ec90a283fc7daf828a8f (patch) | |
tree | eb63f7b8f367d3c21d909beb3c4aee02ba19301c /DOCS/xml | |
parent | a0618fd3103e27253602f2c98b10e82e01267094 (diff) | |
download | mpv-a60574bcbba76c781605ec90a283fc7daf828a8f.tar.bz2 mpv-a60574bcbba76c781605ec90a283fc7daf828a8f.tar.xz |
Remove confusing and probably wrong paragraph about libdvdcss.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@20442 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'DOCS/xml')
-rw-r--r-- | DOCS/xml/en/cd-dvd.xml | 59 |
1 files changed, 1 insertions, 58 deletions
diff --git a/DOCS/xml/en/cd-dvd.xml b/DOCS/xml/en/cd-dvd.xml index 551e163372..a8ad39a68a 100644 --- a/DOCS/xml/en/cd-dvd.xml +++ b/DOCS/xml/en/cd-dvd.xml @@ -181,68 +181,11 @@ are dynamically allocated. <para> DVD decryption is done by <systemitem>libdvdcss</systemitem>. The method can be specified through the <envar>DVDCSS_METHOD</envar> environment -variable, which can be set to key, disk or title. +variable, see the manual page for details. </para> </formalpara> <para> -If nothing is specified it tries the following methods (default: key, -title request): -</para> - -<orderedlist> -<listitem><para> -<emphasis role="bold">bus key</emphasis>: This key is negotiated during -authentication (a long mix of ioctls and various key exchanges, crypto -stuff) and is used to encrypt the title and disk keys before sending them -over the unprotected bus (to prevent eavesdropping). The bus key is needed -to get and predecrypt the crypted disk key. -</para></listitem> - -<listitem><para> -<emphasis role="bold">cached key</emphasis>: <application>MPlayer</application> -looks for already cracked title keys which are stored in the -<filename class="directory">~/.dvdcss</filename> directory (fast). -</para></listitem> - -<listitem><para> -<emphasis role="bold">key</emphasis>: If no cached key is available, -<application>MPlayer</application> tries to decrypt the disk key with a set -of included player keys. -</para></listitem> - -<listitem><para> -<emphasis role="bold">disk</emphasis>: If the key method fails -(e.g. no included player keys), <application>MPlayer</application> -will crack the disk key using a brute force algorithm. This process -is CPU intensive and requires 64 MB of memory (16M 32Bit entries hash -table) to store temporary data. This method should always work (slow). -</para></listitem> - -<listitem><para> -<emphasis role="bold">title request</emphasis>: With the disk key -<application>MPlayer</application> requests the crypted title keys, -which are inside <emphasis>hidden sectors</emphasis> using <systemitem>ioctl()</systemitem>. -The region protection of RPC-2 drives is performed in this step and may fail on such drives. -If it succeeds, the title keys will be decrypted with the bus and disk key. -</para></listitem> - -<listitem><para> -<emphasis role="bold">title</emphasis>: This method is used if the title -request failed and does not rely on any key exchange with the DVD drive. -It uses a crypto attack to guess the title key directly (by finding a -repeating pattern in the decrypted VOB content and guessing that the -plain text corresponding to the first encrypted bytes is a continuation -of that pattern). The method is also known as "known plaintext attack" -or "DeCSSPlus". In rare cases this may fail because there is not -enough encrypted data on the disk to perform a statistical attack or because -the key changes in the middle of a title. This method is the only way to -decrypt a DVD stored on a hard disk or a DVD with the wrong region on an -RPC2 drive (slow). -</para></listitem> -</orderedlist> - -<para> RPC-1 DVD drives only protect region settings through software. RPC-2 drives have a hardware protection that allows 5 changes only. It might be needed/recommended to upgrade the firmware to RPC-1 if you have a RPC-2 DVD |