Is it possible to have some minimum level of password protection for a TaskPaper document? Is this anything that could be implemented in the future?
I think this is unlikely to happen. I know some apps (such as Apple’s Pages, Keynote, and Numbers) do allow for password protecting files. But it would require a extra work to research and implement… and any bugs that I add mean what you thought was protected isn’t. I don’t think I’ll add this feature anytime soon.
Instead I would recommend:
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Use the security of your OS X account to protect your files. As long as you keep your files in your account no one else should be able to access them.
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If that’s not enough you can encrypt your files … here’s one approach to doing that: Encrypt files for safety | Macworld