From the developer:
"FolderLock allows you to lock files/folders depending on the currently logged on user. FolderLock allows you to lock specific files or the entire contents of a folder. If you share your computer with others, manage networks, download files from the Internet and receive email attachments or would like to secure your files from viruses/hackers and trojans, or have made computers available for public use in your company then FolderLock is just the tool you would need.
"30 day fully functional trial version with nags."