PenyuLocker is another free software from Penyu Radius. PenyuLocker software to secure and lock folder with password. Unauthorised person cannot view the files in folder and cannot even open the folder without the password. PenyuLocker will protect any sensitive files or information from any unauthorised person. Once locked, the folder icon will change to recycle-bin icon but it will not affect the protected files if you empty the recycle-bin. To unlock the folder you will need the correct password.