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DavidThe script is not intended as a complete solution. It will not prevent all people from copying/saving the images. If you know what you are doing, you can copy the images. It will, however, make it more difficult (a pain in the butt to do) and prevent many to most people from taking the images. The average Joesephine will have no clue how to copy the images.
To protect the images, T206Museum both uses the script and puts a text on the images-- which may be the most prudent thing to do.