How to block a License key?
After the License key receives the Blocked status, it cannot be automatically issued or entered manually. You can block only the key that was not previously activated on the user device. For more information about the status of the License key, see here.
1. Set 
to the left of the keys you want to block.
2. Click the Switch on/off button.
3. Select Switch off.
The status of the key changes to Blocked.
