PDF watermarking

PDF watermarking involves embedding a visible or invisible mark into a PDF document to identify ownership, protect against unauthorized copying, or verify authenticity. This process places patterns, text, or images onto the pages, ensuring they serve as a signature or as a layer of security. The watermark doesn't usually affect the document's usability but helps distinguish genuine copies from pirated ones or track distribution. It's a common technique used by publishers, companies, and governments to safeguard digital content without compromising the document's appearance or functionality.