T-Biz Network is a member of the Apple Developer Network and T-Seps is an authorized Adobe plug-in. But, on rare occasions you might get an error that the plug-in is not signed or it is from an unknown developer. We don’t know why this happens but there are no worries. T-Seps and the original version, FastFilms, have been around since 1999 and they are certainly not an unknown product and they are from a known developer. They are safe from any malware or bugs.
If you get this error the fix is easy and is addressed on an Apple Help page HERE
HERE is another page with details.