Where can I find 7.1 or 7.1.4 files?

Cubase
1

The topic has been discussed here, but I can’t find a clear answer to my question.

  1. I have a physical 7.1 setup (and 7.1.4 in the works).
  2. Before I get into my mixing projects, I need to have references to listen to on my system.
  3. Where can I find 7.1 or 7.1.4 files, knowing that DVDs and Bluerays are encrypted and therefore inaccessible?