Read more about F-Secure Anti-Virus 2011 from here
to get F-Secure Anti-Virus 2011 Full version license for free, you need a Facebook account
1. Login to your facebook account
2. Go to account settings
3. Click "Language" tab
4. Select "Deutch" on Primary language
5. Go to F-Secure Germany Facebook page here (better on next tab, so that you can change your language settings after receiving the key)
6. Click 
button
7. Enter name and Email address and click the button "Abschicken"
5. Check email address for the key
[Via Bjoerns Windows Blog]