The purpose of this article is to demonstrate FortiGate DLP Watermarking using FortiExplorer.
Watermarking is essentially marking files with a digital pattern to mark the file as being proprietary to a specific company. Fortinet has a utility that will apply a digital watermark to files. The utility adds a small (approximately 100 byte) pattern to the file that is recognized by the DLP watermark filter. The pattern is invisible to the end user.
If you are using watermarking on your files you can use this filter to check for watermarks that correspond to sensitivity categories that you have set up. The Corporate Identifier is to make sure that you are only blocking watermarks that your company has place on the files, not watermarks with the same name by other companies.
The watermark tool does not work with every file type. The following file types are supported by the watermark tool: .txt .pdf .doc .xls .ppt .docx .pptx .xlsx Currently the DLP only works with Fortinet’s watermarking software.
Using the FortiExplorer watermark tool is shown in the following steps: