#!/usr/bin/perl -w
# 531-byte qrpff-fast, Keith Winstein and Marc Horowitz 
# MPEG 2 PS VOB file on stdin -> descrambled output on stdout
# arguments: title key bytes in least to most-significant order
$_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;
@t=map{$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])
&110;$t^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,
@z)[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h=5;$_=unxb24,
join"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1
$&/;$d=unxV,xb25,$_;$e=256|(ord$b[4])<>8^($f=$t&($d>>12^$d>>
4^$d^$d/8))<>8^($t&($g=($q=$e>>14&7^$e)^$q*8^$q<<6))<>=8)+=$f+
(~$g&$t))for@a[128..$#a]}print+x"C*",@a}';s/x/pack+/g;eval