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A comment on Playstation removing previously purchased Discovery content. Parent comment

Re:Playstation removing previously purchased Discovery content by kmeisthax on Friday December 01, 2023 @07:37PM (#38494569)
That's assuming you only ever run old Blu-Rays on that player.

Blu-Ray has a thing called BD+ on it, which lets content companies run arbitrary native code on your player (among other things). It also lets you update your player's key revocation list for HDCP. So either of these mechanisms could be used to render your old purchased content unplayable.

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Re:Playstation removing previously purchased Discovery content by LoganDark on Friday December 01, 2023 @08:39PM (#38494964)
That's fun... if you connect your DVD player to the internet.
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Re:Playstation removing previously purchased Discovery content by yjftsjthsd-h on Friday December 01, 2023 @08:57PM (#38495083)
No, they can ship updates on new disks and the player will read the code when it reads the movie.
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Re:Playstation removing previously purchased Discovery content by LoganDark on Friday December 01, 2023 @11:02PM (#38495763)
So, pop in a new disc, and it comes with a new list of all the content that is not allowed to be played anymore? Ergo your old discs stop working because your player now knows the license expired or something stupid like that?

That's literally evil.

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Re:Playstation removing previously purchased Discovery content by izacus on Saturday December 02, 2023 @02:35AM (#38496729)
Yep, it was even part of CSS (the older DVD DRM), but there they could "just" prevent playback of a given disc on certain players.

AACS2 allows for carrying revocation lists on discs now.

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Re:Playstation removing previously purchased Discovery content by FirmwareBurner on Saturday December 02, 2023 @01:18AM (#38496411)
Do you have any sources for this?
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Re:Playstation removing previously purchased Discovery content by whatevaa on Saturday December 02, 2023 @02:10AM (#38496617)
I did a work on DRM during my master degree. It's somewhat true, it's called Broadcast Encryption. They can stop your players ability to read new disks. They can't stop existing ones though, unless the disk requires online component or something.

DRM stands for Digital Rights Management, but I call it Digital Restrictions Management cause that's what it is from users point of view.

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Re:Playstation removing previously purchased Discovery content by FirmwareBurner on Saturday December 02, 2023 @08:03AM (#38498335)
Interesting, thanks for sharing
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Re:Playstation removing previously purchased Discovery content by kmeisthax on Saturday December 02, 2023 @05:52PM (#38503003)
https://en.wikipedia.org/wiki/BD%2B

The one thing I'm not 100% certain on is if HDCP revocation list updates go through BD+ or if there's a separate mechanism for those updates. However, BD+ code gets to inspect your player software and modify it, which is sufficient capability to do updates, even if they don't use it for such.

I also don't know if they continue to release updated BD+ code or if they've given up on that.

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