The draftwatermark Package: A Concise Guide to Adding Watermarks to LaTeX Documents | PDF | Te X | Specification (Technical Standard)
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ifdraft: a package that extends document class options draft and final – texblog
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GitHub - callegar/LaTeX-draftwatermark: The "draftwatermark" package extends LaTeX providing a means to add a textual, light gray watermark on every page or on the first page of a document. Typical usage may