Microsoft announce the General Availability of Azure DevOps Server; this is the latest version of the product you may know better by its previous name of Visual Studio Team Foundation Server.
There are no changes to the licensing of this new version and you can buy Server and CAL licences through a Volume Licensing agreement.
Alternatively, Visual Studio standard subscriptions include rights to the Server licence and one User CAL, and all users licensed for Azure DevOps Services have CAL rights too.
You can find the announcement here: http://bit.ly/2FgTv7U, along with confirmation that Azure SQL Database can now be used with Azure DevOps Server in an Azure virtual machine.