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Applying watermarks and digital signatures to printed documents

🔎 Find this feature in the admin interface: Configure > Print Security > After Printing > Watermarking / Digital Signatures

Sometimes the biggest security risk in your high-tech organization can be through the most old-fashioned routes. Once closely-guarded and tightly-permissioned documents get printed, the documents can be read by anyone within eyeshot. Using watermarking and digital signatures on printed documents can help protect the security of the document after it has been printed.

Watermarking

Watermarking can help with visually identifying who printed the document, along with any other useful information needed.

A watermark can be something as subtle as background text at the bottom of the document, helping you find the original owner of the document, or it can also show how ‘current’ the document is with a print date and time. It can also be more invasive - perhaps a full-page watermark, showing the organization name, username, and date - making it impossible to pass off as coming from a different source, and making it more difficult to leak!

With PaperCut Pocket and Hive you can use the following variables in the watermark text - check out the Variables available tip in the interface for the complete list of variable formats:

  • User’s email address
  • Print date/time
  • Document name
  • Printer name
  • Client IP address or machine name
  • Number of copies and pages

There are also a number of options for formatting the watermark positioning, size, and transparency.

Screenshot showing the configuration options for watermarking and digital signatures including custom text and placement on the page.
Making use of Watermarking and Digital Signature features for extra post-printing document security!

Digital signatures

A digital signature is a combination of watermarking with a unique code - unique to every single document printed through Pocket or Hive. As a SysAdmin, perhaps you don’t want to include user email addresses or workstation information on the watermark, but you do want an anonymous way to track who printed the document, from which client, using which printer, and when. Enter the digital signature!

If you find a document with a digital signature from your organization, you can then search for the digital signature within the admin interface job log, taking you to the exact instance the document was printed. This can be extremely handy for getting a sensitive document back to its original owner (without the finder necessarily knowing whose document it was), or in a worst-case scenario, finding out who printed something more nefarious. Only someone with admin rights to your organization’s printing setup can trace back the signature to the source.

It’s also a great subtle reminder for your users that their fingerprint is on the document that they printed out - so they are responsible for the document’s safety and security in that big ol’ world out there!

Digital signatures are available with two different algorithm strengths - basically ‘how long would you like the signature to be?’.

  • SHA1
  • SHA256
Photo (including some tasteful blurring) showing a digital signature watermark applied to the bottom of a printed document.
Watermarking with a digital signature in action. Look at that bokeh!

Watermarking and digital signature frequently asked questions (FAQs)

Do I have to enable watermarking to get digital signatures to appear?
You don’t have to enable watermarking specifically in the PaperCut Pocket/Hive interface, but in the background, we’re using the same technology to apply both. In effect, if you enable a digital signature without enabling watermarking, you’ll get the signature appearing on documents without any of the watermarking text. Secure and minimalistic!
Do watermarking and digital signatures work with any printer?
In the olden days of yore, you’d have to use a printer driver to build your print queue - and that then had a number of restrictions about what kind of functionality worked with which printers. Luckily with PaperCut Pocket and Hive, we’re using the universal language of PDF, so we can insert whatever is needed into the document without worrying about printer models or driver types.
If I find a printed document with a digital signature, how do I find who printed it?
You’ve got the most important piece of the puzzle - the signature. Now just head over into the admin interface and go into Explore > Job Log. You can search the job log for the signature text, and it will find the exact document that was printed using that signature.

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