Distribute ocx with Excel Addin

Hi All,

I've developed an Excel add-in recently, in which I use a MS Flex Grid
(MsFlxGrd.ocx) control. However, when the add-in has been added to the
customer's release of Excel it says: "You do not have a license to use this
ActiveX control.". I found a solution for this problem here:
http://support.microsoft.com/kb/318597 but my question is: Am I allowed to
distribute the msflxgrd.ocx together with my add-in and change the license
registry key accordingly? A business requirement, I have, is that the add-in
shoud be distributed as .xla for Excel 2003 or .xlam for Excel 2007.

Thanks in advance.