You can't edit a PDF file without the permissions (author) password and Adobe is never going to change that for obvious reasons.
If you want to prevent others from opening the file, the simplest solution is to add it to a ZIP archive and set a password on that.
I am not asking to be informed by the author/creator of the file of what the Permissions password is, I only want to add my own. The security features set by the Permissions password can stay in place! I fail to see how adding an 'Open' password to a file (by the recipient) can detract from the security of a file set with the Permissions password (by the original author)?
I'm not so familiar with WinZIP. Could you give me some guidelines on how to set up such an secure archive please?
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Adding an Open password changes the file in a way that isn't allowed by the security restrictions that are in place. In Acrobat you can include the file as an attachment to another PDF that has the security you want. To do this in Acrobat, select: Tools > Protection > More Protection > Create Security Envelope
and then apply password security to the resulting file.