Watermarking is used for:
1) Copyright protection
2) Authentication
Culture Secretary James Purnell was late for the photo at Tameside General Hospital in Greater Manchester, turning up after three other MPs had to leave. James Purnell's image was added to the photograph later.
An NHS trust has admitted superimposing an image of a government minister into publicity photograph for a hospital building project (BBC News - 28 September 2007)
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