This can avoid copyright issues, issues of theft, and misuse of content.
PDF watermarks are used to claim ownership of content. 
Watermarks make documents difficult to read and thus increase the security of the document.
One most common reason behind putting a watermark is to prevent unauthorized use of a document. A DF can have more than one watermark too, different for different pages of a document. They are fixed and can’t be moved, changed, or deleted by anyone reading the file. Watermarks are like stamps that are integrated into documents. These have watermarks on their pages that contain sensitive information. Sometimes, we see files that have the word ‘CONFIDENTIAL’ written in bold letters. 
It can be in front of or behind the existing content of the document. A watermark is mostly some text, an image, or a pattern placed on a document.
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