These comments have existed on the Internet for more than a month now, I was foolish to have missed it. Anyway, there is some interesting nostalgia about the 5.0 version engine of Authentium technology on John C. Sharp's blog. You can read it here: http://authentium.blogspot.com/2007/05/version-v50-release.html Some interesting tidbits: Does this mean a better/faster unpack engine, or packer specific detections in the heuristic engine? I'd say the latter, but the article isn't entirely clear on that. Of course, there's also a healthy signature detection improvement: Whether all these signature detection and heuristic detection improvements come solely from the use of the F-Prot 4.x engine, or whether there is custom technology involved is uncertain (judging by the claims I'd say there is custom technology in at least the heuristics). I guess Authentium's rather average showing did put on a bit of stress on the company. Calling something a "nine month old product" and saying that it is why the detection rates were "poor" is not an excuse, after all this nine month old product was what was available in the market at the time of testing. But anyway... i.e. hopefully we can expect a pretty good product in the version 5.0 release from Authentium, and also it is possible that this time Authentium and F-Prot might differ in detection rates by more than just a few percent. Time will tell. What do you guys think?