How do I know if a AWS Server instance has license SQL Server Standard or SQL Server Web? I'm looking my AWS billing and this doubt has come up. How do I know if a specific instance is running SQL Server 2008-R2 Standard or SQL Server Web? (using the AWS Console or SQL Server Management Studio)

The Management Studio About shows the following:

Microsoft SQL Server Management Studio 10.50.2806.0
Microsoft Analysis Services Client Tools 10.50.2806.0
Microsoft Data Access Components (MDAC) 6.1.7601.17514
Microsoft MSXML 3.0 6.0
Microsoft Internet Explorer 9.0.8112.16421
Microsoft .NET Framework 2.0.50727.5456
Operating System 6.1.7601  

Looking for version 10.50.2806.0, I've saw that it may be related for both licenses (link), so I don't know how to distinguish them.
Run SELECT @@VERSION; in a query window, with results to text. You will see something like this (minor details will vary) in the Messages pane:

Microsoft SQL Server 2014 - 12.0.2402.0 (X64) 
    Aug 13 2014 11:36:34 
    Copyright (c) Microsoft Corporation
    Developer Edition (64-bit) on Windows NT 6.4 &lt;X64&gt; (Build 9841: )
----^^^^^^^^^ edition will be here


Help > About in Management Studio is just about the client tools, so may not even reflect the same version as the server, never mind that Management Studio no longer has any edition differentiations.