An Activation-based license is stored in Trusted Storage after being loaded on one machine.
It may be necessary to re-install or move the license from one machine to another for one of the following reasons:
How can the license be rehosted?
After activation, the license cannot be re-installed or modified.
You will need to return the license to Xilinx from the machine on which the license is stored before you can generate a new license.
To return the license, see (Xilinx Answer 60525).
Note: In cases where the return operation is unavailable, you must contact Xilinx Customer Service to have the obsolete license removed from your account.