I remember that I read once that if you use the software only in your organization you can forbid your employees to copy the software and release it elsewhere. The reason, when I remember correctly: The employee uses the software only during work on devices provided to them by the organization with the software pre-installed. So the software was never really distributed to the employee and also legally not the individual but the organization uses the software during their working hours.
Unfortunately I can no longer find the article. So I can just tell it out of my head, obviously that’s no legal advice.
Maybe someone else also remember something like this?