From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1Rc4s2-0003Nm-87 for garchives@archives.gentoo.org; Sun, 18 Dec 2011 00:44:54 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id E726321C131; Sun, 18 Dec 2011 00:44:38 +0000 (UTC) Received: from mail-ey0-f181.google.com (mail-ey0-f181.google.com [209.85.215.181]) by pigeon.gentoo.org (Postfix) with ESMTP id D779521C042 for ; Sun, 18 Dec 2011 00:43:38 +0000 (UTC) Received: by eaaj12 with SMTP id j12so4580606eaa.40 for ; Sat, 17 Dec 2011 16:43:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=RDfEpxx2dq0NlBjgGulNJXXA5C19FAuhyActNwW/tVY=; b=EbUkjVKWpdau65fWc7dE66ehsAmSUULr4+le7+CJn+la7WJqRnN/TZvabW8CDS3GY1 Zr1e5mLYMdlu6NQ92V7O+IzO78zhnRnljkcCRNIzu9ZPN6P5WM1OJePJeyAqniPVCvJG yTS3pRQzm517cGcn/SymZibNOIflNCSu1J+aE= Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Received: by 10.204.143.137 with SMTP id v9mr297517bku.116.1324169018032; Sat, 17 Dec 2011 16:43:38 -0800 (PST) Received: by 10.204.226.72 with HTTP; Sat, 17 Dec 2011 16:43:37 -0800 (PST) In-Reply-To: References: <20111217230341.1c9357ca@digimed.co.uk> Date: Sat, 17 Dec 2011 19:43:37 -0500 Message-ID: Subject: Re: [gentoo-user] Re: DVD Movie backups From: Michael Mol To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Archives-Salt: 493a368e-90a3-4a74-bf72-0654c8107f76 X-Archives-Hash: 684a670eabd29b9bc1295ee63fa4eca0 On Sat, Dec 17, 2011 at 7:35 PM, Mark Knecht wrote: > On Sat, Dec 17, 2011 at 3:03 PM, Neil Bothwick wrote= : >> On Sat, 17 Dec 2011 20:13:43 +0000 (UTC), Grant Edwards wrote: >> >>> Yep. =C2=A0I'm not aware of any Linux software that can create an encry= pted >>> DVD -- but I've never had a desire to do that, so my lack of knowlege >>> of such a thing shouldn't be used as an indication of non-existence of >>> such a thing. :) >> >> You also don't have the hardware to create them. CSS keys are stored on = a >> separate area of the disc, an area that is not available on DVD-Rs, >> which is why yo cannot copy a CSS-encrypted DVD with dd, it copies the >> encrypted data but not the decryption keys. >> >> >> -- >> Neil Bothwick > > Interesting but still a little confusing. My DVD-RW drive can > apparently _read_ the CSS keys because xine can play the DVD. I'm > assuming here that the Linux DVD libraries need the keys but maybe > they don't actually even need them to play a DVD if the encryption can > be broken without the keys. > > I guess you are saying that either the CSS keys are completely > unnecessary, The CSS encryption scheme is incredibly poor. Where it's actually applied, it can usually be cracked fast enough that you wouldn't notice a stutter in playback. > or that the DVD-RW drive can read but not write to the > area where they are stored? They may be read, but not written to. In order to read them, your player software needs to present the DVD-reading devices with some kind of credential. DVD playback devices are supposed to be licensed, and this is the hardware means of enforcing that. Consumer DVD burners aren't able to write to the portion of the disc where keys are stored, either. This is part of the copy protection mechanism of CSS. --=20 :wq