When sharing private and confidential documents with others it is often useful to create a zip archive that is encrypted. Whilst this is not a guarantee that the password or the encryption can not be compromised, it provides a level of casual protection if sending the documents by email. For stronger protection use strong encryption like Pretty Good Privacy.
$ zip --encrypt myarc.zip myarc/*.pdf
Do note that the zip archive will include the file names in clear text and thus it is best not to name the files that may indicate their contents.
$ unzip -l myarc.zip # List contents
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