It was announced a few weeks ago that Microsoft had acquired AVIcode and now they finaly released a trial version and give an update regarding the new licensing.

You can download and use this software only if you are a licensed holder of a qualifying Microsoft System Center Server Management Suite Enterprise (SMSE), Microsoft System Center Server Management Suite Datacenter (SMSD).

http://www.microsoft.com/systemcenter/en/us/avicode.aspx

and if you want to read some documentation regarding Avicode you can find it here: http://www.microsoft.com/downloads/en/confirmation.aspx?FamilyID=3aa9a2e1-2b99-4f80-b633-e2c3cd32a78d