If you are looking for a completely free way to protect folders without a paid key: How to Register Folder Protector - KakaSoft
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Allows you to use the core locking functionality, but some advanced security features might be restricted. If you are looking for a completely free
: You can use Windows' native BitLocker or Folder Encryption (EFS) to secure data without third-party software. Kakasoft Folder Protector Registration Key Free