All photos are right-click protected to prevent clients from downloading them. Photos are also resized before the client can view them so even if they take a screenshot the quality will not be high enough for them to print it properly. Watermarks are also optionally added based on your settings to photos. To setup watermarks please see My client would like to download the full resolution photos. How can I allow them do this?

Yes, watermarks can be applied on a project or gallery basis.