I was talking last week about security to a number of people. We talked about the "Save as certified" option, which is an easy way to add a digital certificate to a document, kind of like a wax seal.
Later, on the drive home, I considered how most information leakage occurrs by accident rather than malicious design. So, it put me in mind of another conversation I'd had a few months ago regarding using watermarks to very clearly display if something was "Company Confidential" or "Internal use only". This is an easy way to help prevent the unintentional distribution of sensitive material.
You can give your PDF documents a watermark very easily...
1. Open a PDF and go to Document > Watermark > Add
2. For the Source, you can either type in text or use an image. If you use an image, choose
(After choosing your image you’ll see a preview of your PDF with the watermark)
3. To improve the document readability with regards the watermark’s appearance, you can change the Opacity down to 30% and for the Location of the watermark choose
4. You can also adjust where the watermark appears on the page in the Position section.
This gives you a document that can clearly state it's usability status.
You also have the option to make the watermark visible only in print rather than on screen too.