Many things

[der Mouse]

> I recently wanted to send something to someone relating to a
> non-computer related project I'm working on, and due to what it is, I
> don't want anyone being able to modify the file, but I don't mind
> them printing it out, I was able to do this with PDF.

Sorry to burst your bubble, but you weren't.  All you were able to do
is make it a bit harder.  (If it can be printed, it can be captured and
modified - at least until they get DRM pushed into printers, and given
the installed base, that won't be a for a while yet.)

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