| 摘要 |
The present invention relates to adding watermark information to film prints. This performed when duplicating an original film print ( 405 ) to an undeveloped copy film ( 407 ), where a surface of the original film print is positioned close to a surface of the undeveloped film. The surface of the undeveloped film is exposed with light transferred through the surface of the original film print. The watermark is obtained from a number of individually controllable light sources ( 411 ), such that the light transferred through the surface of the original film print ( 405 ) has a predefined pattern depending on how the light from the light source ( 409 ) is controlled. The invention further relates to a storage medium comprising instructions for performing the method of adding watermark information, a system for adding watermark information and a system for determining the legality of a film print copy.
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