Password Protect a Folder on the Mac « Michael Eakes. I was looking for a way to password protect a folder on the Mac.
I needed to be able to backup a large collection of files onto a USB hard drive and then send it securely through the mail for safe off-site storage. For some reason, this functionality is not integrated directly into Finder. Finally I stumbled upon a way to do it with built-in OS X software. That is perfect because I wanted to avoid using random 3rd-party trialware for something that an operating system ought to be able to do for free. Folder Lock. Dirkey.