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TrilogyEC Professional EditionScreenshot 

 

The TrilogyEC Professional Edition was developed by Trilogy Solutions, Inc ( TSI ) as an absolutely FREE encrypted chat, instant messaging (IM) and file transfer application. TrilogyEC utilizes 256 bit Advanced Encryption Standard ( AES ) cryptography to deliver U.S. military grade security in an instant messenger / chat hybrid program. With the TrilogyEC, you can collaborate with up to 5 people simultaneously in a secure environment.

Screenshot of TrilogyEC Professional Edition