HOW to use keyfile :

Steps : 

1. Open Kaspersky 2011 License Manager (from lower right corner).
2. Click \'Activate the application with a new license\' button. (Delete any trial key first, by clicking the red X next to the key).
3. Disable your internet connection (either disable Network adapter from control panel or turn off your modem/router).
4. Select \'Activate commercial version\' and enter the activation license code as  T1JVS-NNMBD-K1QTN-SUBP8
  or select \'Activate trial license\'.
5. Click Next, an error dialog box will open as shown below:
6. Click Ok and you will now get the option to activate kaspersky using a key file.
7. Browse to the key location and activate kaspersky.




it is not black listed till now. 
if it is blacklisted let me know.
enjoy!.