On: I reverse engineered Google Docs to play back any ...

[asdfasgasdgasdg]

Considering Google doesn't really support anonymous accounts very well, and anyway only the owner and at most collaborators can see version history, the idea that there's a practical attack here seems pretty far-fetched.

[jariel → asdfasgasdgasdg]

I don't think that's the right way to look at it. If there is no reason to store specific information - then don't.