Answer by egreg for PDF with un-copyable text in LuaLaTeX
When using LuaTeX and system OpenType fonts, the CMAP resource is inside the fonts; so unless one is able to find a way to override the resource written in the PDF file when the font is (partially)...
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In Is it possible to produce a PDF with un-copyable text?, it was suggested the following code to disable the coyable text from a pdf viewer.% pdflatex is...
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