PhotoShelter provides an extremely flexible and powerful set of tools to control how your website visitors and clients may interact with your images. You may control who may see your images, as well as who may download them, at what size they may be downloaded, until when, and more. To get the full scoop, please read these detailed articles:
For more on setting the visibility for your galleries and collections, check out our detailed Gallery/Collection Visibility: Who Can View Your Images? tutorial.
For more on enabling downloads of your images, check out our detailed Gallery/Collection Access: Who Can Download Your Images? tutorial.