The "Duplicate Watermark in Sale/Purchase/Invoice Report" Odoo app adds a watermark to your reports, such as sales orders, purchase orders, invoices, and bills. This watermark helps prevent unauthorized copying or tampering by marking the document as duplicates. You can easily identify and track reports that have been printed multiple times. The watermark appears across the document, making it visible without affecting the readability of the content. This feature ensures your reports are secure and transparent, especially when handling sensitive business documents like invoices or purchase orders.