How does photo watermarking work? I want to protect previews from being ripped.

You can apply a watermark overlay to guest-facing photos — an image, usually your logo or a copyright mark, laid over each shot. You control it per album: disable watermarks entirely, use your profile defaults, or set a custom position just for that album. It's a deterrent more than an absolute protection — a determined person can always screenshot — but it keeps casual ripping off your work to near zero and keeps your name on images that get shared around.