Their primary launcher, the Ariane 5, was scheduled to be retired and replaced with the Ariane 6, but there were delays in the project. It left them with an awkward transition phase where no new Ariane 5s were being built, but Ariane 6 wasn’t ready yet, so all they could do was launch the last of the 5s.
They can’t use this code at all, it would be a surefire way to get the project shut down. Reverse engineering is the only way to operate something like that legally.