Research preventing image downloads

Research preventing image downloads, and also research encoding images with metadata.
NOTE: No need to investigate preventing image downloads for sites other than spotlight

General Info

• https://graphpaperpress.com/blog/protect-website-image-stealing/
• https://support.squarespace.com/hc/en-us/articles/206542457-Preventing-visitors-from-downloading-your-images-and-audio
• https://wp-modula.com/protect-images-website-theft/

IIIF

• There is not any built-in method to prevent image downloads
• Can disable right-click. see here; can we do this conditionally?
• This Article on how you can get hi-res images from various sites, mentions that Stanford makes things particularly difficult by disabling the ability to download a full resolution image. But you can still right-click and download low res images. Need to check to see what stanford is doing to dissallow dowloading hi-res image
• GSU doesn't do anything fancy, they use a watermark
• Perhaps provide a download option and add a watermark just to the downloaded image.

Seems like the options are:

• Disable right-click on images--can we do this conditionally?
• Add a copyright notice
• Watermark images (I know we don't really want to do this)
• Restricting HTTP referrers and others from embedding your website’s assets (such as images) on other websites. This is sometimes known as hotlink protection.
• Monitor, Resolve, Takedown, using a service such as Pixsy