Image grid and user rights

Hi Discourse Team,

I want to use the image grid, but only show the thread with image-grid to unregistered users.
The full size image should be restricted to registered users.
So when you click on a image in the grid there should be a message like “for registered users only”.

Is there a easy way to do this with discourse?

It would be okay that the image-URLs are in the source-code. Its not about security …