SecretShredder 0.4.2 for Mac was available as a free download on our software library. Our antivirus check shows that this Mac download is virus free. The program is included in System Tools. The actual developer of this software for Mac is mizog.com.
From the developer:
Files can remain on your Mac even after they have been deleted or moved to the trash. Indeed using techniques like magnetic force microscopy data can be retrieved even after your drive has been formatted.
The only sure way to delete files and clean up your free disk space ( where files previously moved to the trash may still lie ) is to overwrite them many times using well-known bit patterns so that they can never be recovered.
You may want to check out more software for Mac, such as WheresTheFreeSpace, which might be related to SecretShredder.