On Fri, Oct 24, 2014 at 3:56 PM, Robert O'Callahan <[email protected]>
wrote:

> On Sat, Oct 25, 2014 at 6:17 AM, Ehsan Akhgari <[email protected]>
> wrote:
>
> Can we keep track of where the stream comes from, and make sure to taint
> > the images that can come out of them similar to the way that we taint
> cross
> > origin images by default to prevent them from being read back on the
> > client?  I think with that, and a prompting similar to the camera
> prompting
> > of getUserMedia, we may address a good chunk of these issues.  (But
> > admittedly I haven't thought very carefully about this yet.)
> >
>
> This is hard because normally you want to transmit these screenshots or
> sequence of screenshots somewhere. If an app is transmitting them, it can
> probably capture them at the other end.
>
> I guess a permissions approach with an always-on reminder that your screen
> is being captured can probably work.


Unfortunately, for the reasons I mentioned in the post I linked to above,
it's hard for the user to give informed consent here, as they don't
understand
SOP, CSRF, etc.

-Ekr
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