Protected Screen 3.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program belongs to Security Tools. The actual developer of this free software for Mac is Samuco.
From the developer:
Don’t trust your co-workers? Annoyed at people messing up your files when you leave the computer for 20 seconds? Download Protected Screen to protect your computer from wandering hands.
You may want to check out more software for Mac, such as Boss Screen Pro, Bluetooth Screen Unlock or Video Screen Lock, which might be related to Protected Screen.
Screensavers
Antivirus