Hi there, @Darryl_Roberts 
You can preview the files right on the website using the File Viewer layout:
At the moment, it’s impossible to complete disable downloads and prints, but this idea is already on the Wishlist and you can upvote it here - Do not allow downloads or prints.
I also see that you’ve started using the Flipbook widget for this case and my colleague Daria shared a CSS code to hide Print and Download buttons there, which worked fine for you.
If you have any questions left, we’re always here to help 