Additional SQL Server features and topics not covered by specific categories
The databases themselves aren't licensed; the server/instance is.
It sounds like you want to change to a different edition (from Developer to Enterprise or Express). This Docs link can walk you through this.
Note that the Developer edition is virtually the same as the Enterprise Edition, so this upgrade should be straightforward.
You'll also want to check out the supported upgrade paths in this article:
If you are also moving the database to another server, you'd likely want to use backup and restore to move the database to the new server.