Attribution.txt « firmware « resources « Cura - github.com/Ultimaker/Cura.git - Unnamed repository; edit this file 'description' to name the repository.
==MarlinUltimaker==
The MarlinUltimaker-*.hex firmware is build from https://github.com/Ultimaker/Marlin and released under GPLv3
The sources for the included firmware are taged with the first Cura version number which includes the build.