Does CS-2000 need to pay the fee for using and upgrading the Anti-Virus?

The CS-2000 provides two virus scan engines-Clam and Sophos.
The Clam is free for using and upgrading.
You don't need to pay any fee for using it.
The Sophos is a commercial Anti-Virus Engine. You need to pay a yearly fee for using and upgrading it.
If you want to use Sophos,please contact the local distributors for pricing.
You can select the Virus Scan Engine in Mail Security--Anti-Virus--Setting menu.
The default setting is Clam.