Just as a fore-warning: I have searched the forums and didn't find this specific question asked/answered. I have a personal bank account spreadsheet. I would update this daily. Here's my question: is there a way Mac OS X can password protect a file/folder that can be constantly updated? Yes, I know there is Disk Utility - Make a protected disc image BUT I would like to update this file daily. And I am not interested in 3rd Party software. Thank you in advance for help.