Why is Norton Zone logging my application activity?

I installed Norton Zone for Mac on my iMac running OS X 10.9.2 "Mavericks" (this is just the cloud storage service, I don't have any anti-virus stuff installed), and I find that there is a file here:

 

/Users/me/Library/Logs/NortonZone/NortonZone.log

 

... which is logging all my application launching activity.

 

Why is this?  Why should this be necessary for the cloud storage service?

 

I'd appreciate a reply before I delete what looks to be some form of spyware.