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Author Topic: pdf file fingerprinting  (Read 833 times)
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Magnox
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« on: September 28, 2012, 02:35:46 14:35 »

Does anyone know anything about automatic document watermarking or fingerprinting, as in, do certain online magazine publishers do it?

For those unaware, systems exist to automatically add encoded and hidden information (for instance the username of downloader  Shocked ) to documents as they are downloaded from a server. Obviously useful for purposes such as copyright enforcement!

Some time ago there was a rumour that this was happening, and at the time I managed to obtain a document from two different sources, and there was no difference between them. That would indicate that such watermarking was not happening at the time. It was quite some time ago though, and things could well have changed.
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pickit2
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« Reply #1 on: September 28, 2012, 03:39:11 15:39 »

search forum for "pdf watermark" this has been posted many times, loads of tools to remove watermark has been posted.
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