I have successfully injected Windows Server 2008 R2 into install.wim of Windows 7, also injecting the server license files into the corresponding boot.wim.
Server 2012 R2, however, does not seem to have the sources/license subfolder that 2008 R2 used to have. Still, the windows setup complains when I try to install from an install.wim where I added 2012 R2. This means there presumably are license files, but I have no clue where.
Using search in the Windows 8 / Server 2012 unattended forum and in the multi-boot forum did not yield anything; neither did plain googling.
Could anyone please point me at instructions how to merge Server 2012 R2 including license files?