Being closed source makes this is highly suspect at the outset.

From my perspective it could be a trojan horse, even if the author claims otherwise all day long.

Bottom line, its security cannot be verified, so this might as well be considered dead in the water as far as being a viable tool for security.

Furthermore even if it was real, using it would limit your communication to people who are running Windows...

Simple fix for all this: release it as an open source project.