Re: Confinement (even with TPMs) and DRM are not mutually exclusive

[Eric Northup]

On Tue, 2006-06-06 at 14:06, Jonathan S. Shapiro wrote:
> On Tue, 2006-06-06 at 11:13 -0400, Eric Northup wrote:
> > There are situations where programs want to know that they have a
> > *mostly* private communication channel to an output device.  For
> > example, a spreadsheet which stores patient information in a medical
> > practice must be careful that random applications don't take
> > screenshots or steal their clipboard contents.  Also, password entry
> > dialog boxes, etc.  But these applications do not want to prohibit the
> > *user* (ie, the shell) from taking screen dumps....
> 
> Actually, this last sentence is not correct.

Why not?

The user is in a position to record and disclose the information anyway
(using, for example, a digital camera to take a capture of the screen).

I'm not arguing that its a good idea, or that users should be
encouraged to take screenshots of their passwords, but rather that I
don't see any fundamental reason to prohibit it.

What am I missing here?

-Eric