You can make it harder for them to copy images and texts (Kopier- und Downloadschutz / Printschutz, German), but you cannot prevent them from making screenshots (they may simply take a smartphone and make a photo, no matter what measures you employ) and most users with some technical background will also know the developer mode of the browser and can simply disable all your copy protecten measures there.
Providing web sites via HTTP means you send the users the texts and images, and if they have it, they can also save and copy it.