The system extension /System/Library/Extensions/WkClassicNotSeizeDriver.kext was installed improperly and cannot be used

After upgrading to Mac OS X 10.10 (Yosemite) I was regularly getting a pop up error saying that the system extension /System/Library/Extensions/WkClassicNotSeizeDriver.kext was installed improperly and cannot be used.

After some digging into the bundle, I determined that this is a USB driver from WIBU-Systems from back in 2002:

CFBundleName = "WkClassicSizeDriver";
CFBundleShortVersionString = "WkClassicSeizeDriver version 1.0.0";
CFBundleGetInfoString = "WkClassicSeizeDriver version 1.0.0, Copyright 2002 WIBU-SYSTEMS AG, Inc.";
NSHumanReadableCopyright = "Copyright 2002 WIBU-SYSTEMS AG, Inc.";

I recall installing a driver from WIBU systems when I once ran ArchiCAD on my system a long time ago, which needed it for a copy protection dongle.   My ArchiCAD has long since gone, and nothing else I have uses a WIBU dongle, so I just deleted the extensions.

If you have in the past had a copy protection dongle which used the WIBU system and no longer use it, then you can safely delete this.  If you still use it, then you should download the latest drivers from your software vendor or from the WIBU systems website at http://www.wibu.com/