JBMJBM has released Hide Files (http://www.jbmjbm.com/hidefiles.html) for Mac OS X 10.6 or higher. It’s available for US$2.99 in teh Mac App Store in the Utilities category.
Hide Files is a program for the Mac that protects documents and folders from others viewing, modifying, or y deleting. It’s as easy as dragging the file or folder into the app and clicking Hide, instantly those files/folders and all their contents are concealed. There are options to enable password protection of hiding, which ultimately removes access.
This is a standard and simple way to make files/folders on the Mac operating system invisible. If you need advanced levels of protecting your data, there are other ways to accomplish this including Mac OS X FileVault and various other removable media types.