Are there alternatives to watermarking?
As a watermark is unable to guarantee compliance perhaps it is not worth doing at all, though consider the commercial value of the collection before it is left unprotected. Some archives require users to register before they can access the collection, images can also be protected by disabling the right mouse click (copy) function, pictures can be sliced up or placed in java applets to make copying more difficult. Individual documents can be saved as Acrobat (PDF) files with password protection. There are also software solutions, which encrypt data; the end user must have a personal ‘key’ to access the data. These software solutions will also allow the owner to amended or revoked licences after final delivery.
