For example, users can denote the document as a draft, a final copy, a confidential document, a sensitive document, or whichever other categorization needs to be constantly made apparent. In addition to this, the watermarking feature can be used to protect intellectual property, as placing it on top of the text makes it more difficult to copy, and easier to detect which version is the original.
This feature is slated to roll out to desktop users on February 14th and there is currently no word on when this feature will come to the Google Docs Android app.
Image Credit: Google
Source link: http://www.trendhunter.com/trends/insert-watermark