Configuring the DLP Watermark

You apply watermarks when you introduce custom XML files that contain the watermarking data. Only documents in these Office Open XML formats can have a watermark:

  • DOCX

  • PPTX

  • XLSX

Important - Older formats supported in Office 2007 and above for backward compatibility (such as DOC, PPT, and XLS, cannot be watermarked). If you change the file extension from doc to docx , it does not make the document eligible for watermarks.

If the DLP Gateway scans the Data TypeClosed Classification of data in a Check Point Security Policy for the Content Awareness Software Blade., and this Data Type occurs in the body of the email and not the document, the document is not be watermarked. For example, when you scan for credit card numbers, if the credit card number shows in the body of an email with a document attached, the document is not watermarked. The Data Type must occur in the document.