SQL Server 2012 Enterprise Edition uses specific product keys depending on whether you are licensing by Server+CAL

The product key for SQL Server 2012 Enterprise Edition is a unique 25-character alphanumeric code used to unlock the software's most advanced features for high-scale data warehousing and mission-critical applications. Unlike the free Express Edition, the Enterprise edition requires this specific key to activate capabilities like AlwaysOn Availability Groups and data compression. Key Facts and Management

The "i---" Code: Specifics of the Mask

Veteran sysadmins might recognize that the "i---" sometimes refers to a specific Release Candidate key or a Developer Edition key that was erroneously labeled as Enterprise.

Conclusion

A SQL Server 2012 Enterprise Edition product key typically consists of 25 characters, divided into five groups of five characters each. The format is as follows:

If you're looking for a SQL Server 2012 Enterprise Edition product key, here are some options:

: For many volume-licensed versions, the product key is embedded in the DefaultSetup.ini file located in the folder of your installation media. Official Sources

System Requirements: