Hi,
I noticed this whilst testing an Avira product:
"Using GTUBE test spam pattern...Scan report:
Sophos AntiSpam SDK
Implementation by GBS V 18.1.0.7457.n/32, [Oct 2 2015 19:26:01]
(c) 2005-2015
GROUP Business Software"
So do the 2 companies have some kind of cross licensing deal or something?