Watermark removal is two tasks: finding the watermark (object detection) and rebuilding what was behind it (inpainting). Each model on this page is one of those two, listed with its licence, expected input size and the export step it needs. A detector and an inpainter must be paired — the browser cannot run one without the other.
Nothing here is downloaded automatically. Each entry links to the project that publishes the model, so the licence that applies is the one stated by that project, not PureSnap's. Imported models run locally in your browser exactly like the defaults: no image is uploaded, and a locally chosen file only lasts for the current session.