The 1.0 version of Protectorr for Mac was available to download on 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 software relates to Productivity Tools. This free software for Mac OS X was originally created by Devcorr Technologies, LLC.
From the developer:
Protectorr is a free, open-source application that allows you to password-protect your local PDF documents offline. All you need to do is browse your computer for PDF files and set a master password for the selected document. This will help you share your PDFs securely.
You may want to check out more Mac applications, such as PitStop Extreme or FileOpenInstaller, which might be related to Protectorr.