The PDF watermark may be something as simple as a unique number that is associated with the authorized user of a document, or it may be their name, email address, company name and so on. PDF watermarking is a useful way to link an identity to a document. Using watermarks to link a user to a document For example you might watermark a PDF with “copy” before printing and/or when it is viewed. This is achieved by adding a stamp or text to a PDF document to mark it appropriately. Using watermarks to identify the document as an original or copy For example, adding a confidential watermark or a ‘top secret’ watermark as a stamp or text. This is the method of classifying documents by adding a watermark to them that displays how the document should be treated. Using watermarks to display classification This might include text such as ‘It is illegal to copy content from this document’, and/or by using dynamic watermarking to display user information so that users are discouraged from giving copies to others. But PDF watermarking is significantly better than doing nothing.) Using watermarks as a copying deterrent There are still fake banknotes doing the rounds and one pound coin in 36 is a fake. It doesn’t mean documents can’t be faked. (This is how you know a 20-dollar bill or a ten-pound note is genuine. This use of PDF watermarking can be very important where official documents have to be printed/printable and must be demonstrated to be authentic. If you try to make a fake it can be made very difficult to exactly copy the PDF watermark, so anyone seeing the document will also see that it is a fake. When using watermarks to resist falsification, PDF watermarking is used in exactly the same way as watermarks on banknotes or cheques. to link the document with a specific authorised user.to specify the document is not an original.One way to improve the security of your PDF documents is to add a watermark to them – see also Using Document Watermarks as a copying deterrent. What is the point of watermarked PDF files – why add watermarks to a PDF? It is not necessarily a mechanical process of having a ‘bog standard’ graphic and/or text and applying it to every document that goes out. This lets the watermark ‘blend’ with the content so that it has a more seamless presentation and is less distracting, if that’s what you desire.Īpplying PDF watermarking takes a certain amount of discipline and artistic judgement, then. Also, the PDF watermark can be set to be lighter or darker than the content. The content sits in the middle, and the PDF watermarking can be over content, or under content, or both. Think of the information being printed as if it were in layers, rather like a sandwich. You can get a similar effect with PDF watermarks. If you think of a banknote, some watermarks seem inside the paper whilst others are on top. PDF watermarking is able to emulate many of the subtleties of the physical world. Watermarks are added as a layer to the PDF (which is why they are easy to add) and can be made to appear on top of or behind existing document content. In dynamic watermarks, the text is automatically updated with the system/user information at the time of opening or printing. Text watermarks may be static (“This document is the property of ABC Corp.”), or dynamic (“This document was viewed by Joe Bloggs on ”). However, this does not grant you the ability to identify a user if they unlawfully distribute it.Ī watermarked PDF is a PDF that has a text and/or image watermark added to it which is displayed when the document is viewed and/or printed.
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