Is license.txt file in DMD builds up to date?

[Username via Digitalmars-d]

Hello, I've tried to find some information about the license file 
for DMD in windows builds(I'm not sure if it's used for other 
platforms). I'm new to D, literally just downloaded the compiler, 
but as far as I understand the licensing of DMD looks like this: 
runtime, phobos and compiler frontend is Boost licensed. And 
compiler backend is also boost licensed but this still does not 
apply to stable build(DMD 2.074.0),as the source files of backend 
provided with that build still contain the old custom license. 
But license.txt file bundled with windows build(probably others 
too) in stable, beta and nightly version states that: runtime and 
phobos is boost licensed, compiler frontend is under GPL license, 
and also contains the custom license text for compiler backend. 
License.txt file is located in dlang/installer repo ( 
https://github.com/dlang/installer/blob/master/create_dmd_release/extras/all/dmd2/license.txt ). Is license.txt file just outdated or is it that binary builds are licensed differently(I'm not really licensing expert, could this be caused by the bundled libcurl.dll or the windbg tools?)? I'm sorry if this was answered already but I couldn't find any info about this specific file.