Want to ensure financial documents cant be parsed by automated systems
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Zip them into a password protected file or pgp
There’s DRM solutions but they’re by definition not perfect, if it can be read then a photo can be taken
PDF scanning is done by both OCR and PDF analysis so no. If you, a human can read it, a bot can read it too.
Your best bet is the classic inserting BS in a 1-hex-off-white font
This is correct. There are also typefaces that are designed to be difficult for OCR eg https://www.librarystack.org/zxx/
These are, however, difficult for humans to read as well.