If you have lost your key and have proof of purchase, contact – they can often retrieve lost keys associated with a Microsoft Account or Volume License agreement. Never trust random websites offering a "working key" for 12.0.2000.8 . Your data is worth far more than a software license.
These are 25-character alphanumeric codes (e.g., XXXXX-XXXXX-XXXXX-XXXXX-XXXXX ) purchased directly from Microsoft or an authorized retailer. They are (cannot turn Standard into Enterprise) and single-use (though they can be transferred to another machine if uninstalled from the first). Microsoft SQL Server 2014 -12.0.2000.8- Key -...
This article will walk you through every legitimate angle. If you have lost your key and have