[MPlayer-users] Blu-Ray Playback/Subtitles

[Nan Null]

----- Original Message ----
> From: "galenz at zinkconsulting.com" <galenz at zinkconsulting.com>
> To: "MPlayer usage questions, feature requests, bug reports" <mplayer-users at mplayerhq.hu>
> Sent: Thursday, January 17, 2008 8:34:53 PM
> Subject: Re: [MPlayer-users] Blu-Ray Playback/Subtitles
> 
> 
> On Jan 17, 2008, at 1:24 PM, Nan Null wrote:
> 
> >
> > ----- Original Message ----
> >> From: "galenz at zinkconsulting.com" 
> >> To: "MPlayer usage questions, feature requests, bug
> reports"
> 
 
> >> >
> >> Sent: Thursday, January 17, 2008 2:16:22 PM
> >> Subject: Re: [MPlayer-users] Blu-Ray Playback/Subtitles
> >>
> >>
> >> On Jan 17, 2008, at 11:08 AM, Nan Null wrote:
> >>
> >>>
> >>>
> >>> ----- Original Message ----
> >>>> From: "galenz at zinkconsulting.com"
> >>>> In this particular case, I managed to find the subtitles elsewhere
> >>>> and
> >>>>
> >>>
> >>>> convert them into a .srt file.
> >>>>
> >>>> However, this would still be a useful feature to have.
> >>>>
> >>>> -Galen
> >>>> _______________________________________________
> >>>
> >>>
> >>> It would be real nice if you pop the thing in, and it plays,
> >>> encrypted or not.
> >>
> >> There are serious technical/cryptographic issues associated with
> >> that!
> >>
> >
> >> In other words, it may never happen, at least not reliably. I don't
> >> know if you're making fun of me, or if you're serious, but either
> >> way,
> >>
> >
> >> my point stands.
> >>
> >> Subtitle extraction, given that Blu-Ray uses an MPEG-2 transport
> >> stream variant for data storage, does not seem too far-fetched.
> >>
> >> Parsing text is much easier than cracking encryption and re-
> >> implementing a complex application runtime environment.
> >>
> >> -Galen
> >> _______________________________________________
> >> MPlayer-users mailing list
> >> MPlayer-users at mplayerhq.hu
> >> http://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
> >>
> >
> > I didn't mean to make fun of you.  :-)
> >
> > I actually wish that would happen.  I thought some people already  
> > broke the HD DVD, and it's very similar to Blu-ray (besides some  
> > advanced DRM feature).
> > Legally speaking, DVD encryption was broken and played by Linux,
> and
> 
  
> > hasn't be sued yet (or has it?).  If Blu-ray is widespread, it's  
> > very likely that it'll need to be run under Linux.
> >
> > It's very likely that Blu-ray will be widespread in the future. 
> So,
> 
  
> > I just hope that we'll have that feature soon.
> 
> The encryption used on DVDs was quite trivial - both flawed and
> easily
> 
  
> cracked using brute-force. The encryption used on Blu-Ray and HD-DVD  
> is crytographically sound and it is unlikely significant flaws will
> be
> 
  
> found or that brute-force will prove viable anytime soon.
> 
> That said, all DRM (no matter how sound the encryption) is basically
> a
> 
  
> game of giving the user both encrypted data and a decryption key, but  
> trying to keep them from using the decryption key, except through the  
> particular mechanism the media provider chooses.
> 
> Therefore, users have found ways to get the decryption keys for Blu- 
> ray and HD-DVD discs. However, these keys are quickly revoked, so new  
> discs require the extraction of new keys. This means there is not,
> and
> 
  
> likely never will be, a simple library for decrypting the high  
> definition discs, like exists for regular discs.
> 
> Also, the menu system for HD-DVDs and Blu-Ray discs is much more  
> complex than DVDs, so will be unlikely a complete menu system for
> high
> 
  
> definition discs will emerge.
> 
> Do note, in the US, the DMCA forbids the breaking of encryption that  
> relates to copy protection.
> 
> -Galen
> _______________________________________________
> MPlayer-users mailing list
> MPlayer-users at mplayerhq.hu
> http://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
> 

Yes, I know what you mean.  I am an author of a security software package myself.  However, there's a bunch of way to do this.
One way is to create a player with menus and what not that support Blu-ray just like any other player.  So, it doesn't break any copy protection.
Then, provide an easy to use mechanism to look up online or bittorent for a key.  A new protocol can be developed for this too.
Or just provide a field for user to enter in a key.

Key can be hacked much faster than players can be revoked and redistribute new keys to average consumers.

Another way is to provide a simulated runner for a software player.  For example, a software player has a piece of code that decode a certain piece of data.  If that decode portion of the software can be played by a virtual machine, then only that portion of the code needs to be published (assume it's so good at hiding the key).  A virtual machine/interpreter would execute that piece of code (and related data the original player needs).
This an extreme case.  Most of the time, the hacker will be able to get the key out.

The law that protect copy protection scheme just ignore the fact that copy protection mechanism can be weak.  For example, if I want to do some copy protection, and I create a mechanism that is just ridiculously easy to defeat.  Anyone look at it, would be able to break it (this happens all the time, such as shift key to overcome CD auto startup, etc).  If a piece of content a user has belong to them (they bought the media), would opening it using the lack of good protection be unlawful.  It appears so.  However, that is just ridiculous.  There's no formal evaluation by the government whether a copyright mechanism is sufficiently strong to qualify as an "encryption" mechanism.  Also, the users do not break any law regarding copyright.  They only try to access the content not using the tools the content provider provides.

Another mechanism is a bittorent way of coordinated decryption of the key using all volunteer computers in the world.  People just offer some computer power for some purpose, that power is used to decrypt a key.  However, certain keys length will be too long, no matter how many computers there are.  I forget the key length of this (I think they use AES).









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