1)   Universal Shield 4.4.1
Universal Shield 4.4 is a powerful tool, combining data hiding, protection, and encryption: hide your files, folders, and drives, and set access rules. This program has the most flexible security combinations for your precious data.
hide folder, lock folder, folder lock, file lock, folder password,

 2)   Folder Lock 7.0.6
Folder Lock is a full suite solution that lets you keep your personal files encrypted and locked, while keeping an automatic and real-time backup of encrypted files to an online storage. It also offers portable security for USB drives and CDs/DVDs.
Folder Lock, file encryption, file locking, protect folders, data protection, backup online, online backup, password protect usb drive, password protect folder, security suite,

 3)   Free Folder Hider 10.6
Folder Hider can hide and password-protect your files, folders, pictures, and documents in seconds.
folder, lock, folder lock, lock folder, folder locker, lock folders, lock files, folderlock, password protect folder, password protect folders,