It is only necessary to download the appropriate package and start the installation inside Dropbox account to create SafeMonk folder. Everything you put in that folder will be automatically protected by encryption. To access files that have been saved, you will need a key that you choose. Like most similar applications, this too works on the principle, no key - no data.
To protect your data on Dropox you can download the application here, and how it works you can see in the attached video.
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