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It's a version of the age old question on how do you keep someone from stealing your images while still being able to show it. No one can see an image without having downloaded it already. The best you can do is layer in things like watermarks to make cleaning it into a "pure" version not worth the trouble. Same with text, poison it so it's less valuable without a lot of extra work.
That's DRM, and it only works if everyone is accessing the information on devices they don't fully control.