backtop


Print 87 comment(s) - last by glennpratt.. on Mar 27 at 1:48 PM

Latest Blu-ray Disc copy protection circumvented by PC software

Although Hollywood movie studios have little choice in which format they release their high-definition content, companies such as Disney and Fox chose Blu-ray Disc for its added copy protection features.

Since the AACS copy protection scheme was defeated, Blu-ray Disc had BD Plus (BD+), launched in June 2007 as a secondary protection method.

Like any other software protection scheme, however, it was only a matter of time before BD+ would be circumvented. In the latest version of SlySoft AnyDVD HD, released on Wednesday, the top new feature notes that the 6.4.0.0 software can now remove the BD protection from Blu-ray Discs. The release note also mentions that the removal of BD+ increases compatibility with titles released by Twentieth Century Fox.

Effectively an embedded virtual machine inside player hardware, BD+ allows content providers to include executables on Blu-ray Discs to perform specific, content protecting functions. For example, the BD+ virtual machine could run diagnostics on the host environment to see if the disc player has been modified, or to verify that the keys have not been changed.

As part of the BD+ scheme, video may be deliberately corrupted or modified to prevent the ripping of the data stream for piracy purposes. The BD+ environment, once verified, will correct and descramble the content to render it viewable.



Comments     Threshold


This article is over a month old, voting and posting comments is disabled

RE: Once again...
By Protozero on 3/20/2008 6:42:53 PM , Rating: 3
It makes me happy inside when I see Hollywoods protection schemes fail. They should do like some game companies. Make there games ( in Hollywoods case movies ) incredibly large and not worth it to pirate. I know I wouldn't want to waste my time download 5+GB movies.


RE: Once again...
By Rockjock51 on 3/20/2008 6:54:39 PM , Rating: 2
Do you watch your downloads from 0-100%? If not, and you're not using all your bandwith, you're not wasting time.


RE: Once again...
By cmdrdredd on 3/20/08, Rating: 0
RE: Once again...
By joex444 on 3/21/2008 4:13:06 PM , Rating: 2
That isn't even close to being what others feel. Just visit any torrent site and see how many people think it is worth it to download a 5+ or even 8+ GB torrent. Whether its a game or a movie in 720p or 1080p, you'll see people by and large will take whats free.

And to the person wanting lossless -- BluRay isn't lossless. As in, not even close. You could store a very small amount of video in full lossless on a double layer BD-ROM. Just by my quick calculations, I estimate 335 seconds. Yep, full lossless 1080p with no audio, and no menus, and no free bytes left on a 50GB disc will net you about 335 seconds.

BluRay (and HD-DVD for that matter) uses a VLC-1 compression scheme. Turns out that is the same codec as H.264. This is an extremely good codec, albeit a little bit CPU intensive. On average, a full length film will be about 20-30GB with the audio (which isn't lossless, though a disc may have such an option, the standard is Dolby Digital 768kbps or DTS 1536kbps, both in 7.1), without the menu and extras. So, if you have 30GB at 1920x1080, figure you downsample it to 1280x720 -- that should knock out 55% of the space required to maintain the same quality. So, a 13GB 720p file has the same quality as 30GB 1080p file. Clearly, a 20GB 1080p file can fit on a DVD+DL disc when converted to 720p. So, throw in a little more compression from the release group and you can easily fit 1080p on a DVD+DL, and 720p can even be compressed down to DVD+R, though excellent quality can be achieved on DVD+DL. Not to mention the initial 30GB includes foreign language tracks, which are generally discarded.

So, my point is that you are not getting lossless quality from a BluRay disc. And from a compression standpoint, its totally feasible to make a BD video fit into DVD+DL or DVD+R size restrictions without much noticeable video quality loss. Atleast, if we restrict ourselves to consumer products.


"Death Is Very Likely The Single Best Invention Of Life" -- Steve Jobs














botimage
Copyright 2014 DailyTech LLC. - RSS Feed | Advertise | About Us | Ethics | FAQ | Terms, Conditions & Privacy Information | Kristopher Kubicki