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Como faço para proteger arquivos PDF?

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Rui Carlos

Cifrar PDFs no Windows (com MS Office): https://www.howtogeek.com/124824/how-to-password-protect-pdf-files-in-word-2013/

Cifrar PDFs no Mac (com Preview): https://support.apple.com/guide/preview/password-protect-a-pdf-prvw587dd90f/mac

Cifrar documentos em geral (com GnuPG): https://www.gnupg.org/gph/en/manual/x110.html

De referi que convém nunca usar websites que cifram documentos online, visto que nada impede o site de guardar uma cópia do PDF.

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