Why does PGP 10.1.2 attempt auto-update?

I use PGP 10.1.2. under Windows 7 x64. While debugging another issue with a packet sniffer, I noticed that the machine is trying to contact a Symantec/PGP update server, which returns a 503 Service Temporarily Unavailable message. Here is the GET request:

http://143.127.2.49/update4?r=updates_file&ln=D4BGNGWPMYJ6Z2DUER7Z7Z6XMFYC&lang=en-US&ver=10.1.2&build=9

Here is how the response looks in a browser:

Auto-update was supposedly removed from PGP 10, right? Why is it trying to update? Is there a registry key to turn this off?

Mark Berry