Why doesnâ€™t Photoshop â€“ powerful as it is to do almost anything to an image â€“ provide a secure way to embed copyright and other info then lock it so it cannot be removed?
The short answer is: itâ€™s useless. If it can be seen on the computer screen, it can be manipulated. â€œIf the image data is accessible to someone, thereâ€™s no way to force them to keep the copyright notice with it,â€ explains John Nack, Photoshop evangelist.
There are many programs that can open and re-save JPEGs, TIFFs, and even PSDs. These programs can remove or change metadata.
Nack says, â€œThe only way to come close is to embed the copyright in the image with a watermark, either visible or invisible. Digimarc can do it with a mostly-invisible watermark. The less visible it is, the less robust it is to image manipulation.â€