Because I and many people would do just that. Sure, the DRM might work for my grandparents and a few other non-techies but over time I can teach my grandparents how to screenshot an image and others would catch on. People would even make chrome apps to "click a picture and resave it in a shareable format".
I'm not sure what this DRM would solve, if anything, other than pissing off users and giving photographers and other digital-sharing artists a false sense of security.
The "fix" for this with video was mandating a new "secure path* signal protocol which rendered all existing HDTVs and receivers and related equipment obsolete.
This is happening again right now with 4k for those who wonder. Yay.
Oh. And the OS would need to enforce the secure signal path thing at kernel level, with GPU drivers having to support this.
Pretty much a crazy amount of work to prevent piracy for everyone involved, except those who want their content "protected". And it still doesn't work. So all that effort was utterly wasted.
But yay, let's repeat it!
> I'm not sure what this DRM would solve, if anything, other than pissing off users and giving photographers and other digital-sharing artists a false sense of security
You pretty much just described all DRM. I don't see how this is different on any philosophical level.
I'm not convinced he analogue hole won't ever be plugged.
The analogue holes for visual media are the two holes in your skull where your eyeballs sit. The analogue hole won't be plugged until you can implement a secure path into the human brain.
(Probably needs a trigger warning in this day and age.)
I don't think such a scenario is likely, because it requires far too much cooperation between hardware manufacturers, but it is possible. The move to mobile makes this scenario much more plausible than it was a year ago.
Not undefeatable, of course.