4 ms·

Switch to linux and the OS stops caring entirely.

by newt0311 18y ago

tptacek 18y ago
And so does everyone else, because Linux won't play the content we're talking about.
- nailer 18y ago
  Yes it does. You could play HD-DVD media on Linux - I have personally done it. I'm relatively sure you may play Blu-Ray too. It's just like playing WMV or WMA - all you need is a codec - plus a tool to handle the DRM, which, as we're all aware, is inevitably created the day after the DRM is released.
  - tptacek 18y ago
    There's still no permanent break for Blu Ray BD+; there are still titles that Slysoft can't play, and no evidence that the next Macrovision refresh won't stall Slysoft for months. You are drastically oversimplifying.
    - nailer 18y ago
      BD+ was broken last week, as I understand. The VM that implements both BD+ content and BD+ encryption schemes can be emulated. What's left?
      - wmf 18y ago
        I think the VM is emulated only well enough to run existing bytecode samples. If a studio can discover a bytecode sequence that executes differently on the licensed and unlicensed VMs, they can use that code in future movies.
      - tptacek 18y ago
        Bochs can emulate X86 quite well. Does Bochs itself bypass X86 copy protection code? There's two obstacles: (1) The VM emulation has to be perfect, and the Slysoft and open source emulation is reverse engineered. Reactos is Win32 reversed from one of the easiest platforms in the industry to reverse, and it's not perfect; BD+ was designed to be hard to reverse. (2) Once the VM is perfect, so that the next 20 revs of Macrovision's protection code can't just go peek at some dark corner of the VM that Slysoft didn't know about, you still have to use that emulator to beat every successive program that Macrovision chooses to run on it. A major challenge for SPDC, the underlying technology behind BD+, was that it had to be implemented autonomously by numerous consumer electronics companies, most of whom have no expertise in the areas of CS (compilers, virtual machine runtimes, content protection) that BD+ plays in. I expect it to get better over time, not worse.

Switch to linux and the OS stops caring entirely.

tptacek 18y ago

And so does everyone else, because Linux won't play the content we're talking about.

nailer 18y ago
Yes it does. You could play HD-DVD media on Linux - I have personally done it. I'm relatively sure you may play Blu-Ray too. It's just like playing WMV or WMA - all you need is a codec - plus a tool to handle the DRM, which, as we're all aware, is inevitably created the day after the DRM is released.
- tptacek 18y ago
  There's still no permanent break for Blu Ray BD+; there are still titles that Slysoft can't play, and no evidence that the next Macrovision refresh won't stall Slysoft for months. You are drastically oversimplifying.
  - nailer 18y ago
    BD+ was broken last week, as I understand. The VM that implements both BD+ content and BD+ encryption schemes can be emulated. What's left?
    - wmf 18y ago
      I think the VM is emulated only well enough to run existing bytecode samples. If a studio can discover a bytecode sequence that executes differently on the licensed and unlicensed VMs, they can use that code in future movies.
    - tptacek 18y ago
      Bochs can emulate X86 quite well. Does Bochs itself bypass X86 copy protection code? There's two obstacles: (1) The VM emulation has to be perfect, and the Slysoft and open source emulation is reverse engineered. Reactos is Win32 reversed from one of the easiest platforms in the industry to reverse, and it's not perfect; BD+ was designed to be hard to reverse. (2) Once the VM is perfect, so that the next 20 revs of Macrovision's protection code can't just go peek at some dark corner of the VM that Slysoft didn't know about, you still have to use that emulator to beat every successive program that Macrovision chooses to run on it. A major challenge for SPDC, the underlying technology behind BD+, was that it had to be implemented autonomously by numerous consumer electronics companies, most of whom have no expertise in the areas of CS (compilers, virtual machine runtimes, content protection) that BD+ plays in. I expect it to get better over time, not worse.