Can I restrict downloads by usergroup, or specific images?

[Mikethemix]

I would like to add download restrictions to prevent copyright infringement of particularly sensitive images.
Can this be done for certain images eg those posted by a specific user?
Could we prevent users downloading specific images?
Could we prevent users taking screen grab of specific images?
Could we add a watermark to downloaded images - eg all those posted by a specific user or specific images?

Thoughts very welcome.
Regards, Mike
Can I restrict downloads by usergroup, or specific images?

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