Then enter the password when you go to open the folders. Always uncheck the box saying “Remember password in my keychain” to make sure it is always protected by passwords. To be able to open encrypted disk image folders, double-click the. Opening Password Protected Folders on a Mac The largest item in my Mobile Documents directory is a folder named MyBook, which is the name of my external drive. There are actually three library folders on a Mac. Inside this Library folder is the Mobile Documents folder at over 91 GB. When you’re finished using the folder click the “Eject” button so it’s protected again. The largest folder on my System is the Library folder listed at 134 GB which appears under my user account.The disk image will mount in Finder and you can move and remove files and folders to the image like you would any other folder.Double click the image to open it, and enter your password. However, on Apple systems there is a defined plug-in folder within the systems folder structure since the first version of Mac OS X. The encrypted disk image will then be created. While the newer VST3 format has a dedicated installation path all VST3 plug-ins must comply with, the VST2 standard does not know an obligatory folder.Make sure you uncheck “Remember Password”. Click “OK”. Type in a password, or click the “Key” icon to generate automatic password.Go to the folder you want to password protect and select “Image”. From the next window select the image format as “Read/Write”, and encryption as “128-bit AES”. Click “Save”.Open Disk Utility under “Applications/Utilities”. Go to “File/New/Image From Folder”.Password Protect Folders on Mac OS Sierra: