I have a client who would like to sell/license digital content in the form of downloadable PDFs. After payment has been received, we would like to apply a unique watermark to each page of the PDF preferably with information that identifies the customer and the date of the transaction in a way that helps to mitigate unauthorized copying and redistribution. I suspect we'll be writing a custom module to do this but thought I'd start here to see how much we'll be reinventing the proverbial wheel. Thanks in advance for any tips and hints.
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To be clear, the PDF documents in question are not Odoo reports, but rather existing digital content that needs to be uniquely marked for each licensee at time of sale for download.