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Adding a watermark to a PDF is the process of overlaying a text, image, or other visual element onto a PDF document in order to prevent unauthorized copying or distribution. For example, a company may add a watermark to its confidential financial documents to deter employees from sharing them with unauthorized personnel.

Adding a watermark to a PDF is important for protecting sensitive information, maintaining brand consistency, and deterring plagiarism. Historically, watermarks have been used for centuries to mark ownership and authenticity of documents, with the earliest known examples dating back to the 13th century.

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Whiteout on PDFs, also known as redaction or blacking out, refers to the process of removing or obscuring sensitive or confidential information from PDF documents.

Whiteout on PDFs is essential for protecting privacy, preventing data breaches, and complying with regulations. For instance, businesses use it to redact sensitive data such as credit card numbers, social security numbers, and medical information before sharing documents externally.

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