LR doesn't do encryption...which would be pretty pointless on a website as I would assume you want people to see your images. LR can place copyright data in the correct metadata field for any file and it can use this data to place a water mark with your copyright information. This is all done in the metadata fields and copyright data is usually saved and applied to all files as a metadata preset on import.
By the way..you seem to be asking this in the wrong forum. For general stuff this is the place.
So what would have been the right forum?