I'm wondering. If the govt pays you to build software, and you use include proprietary libraries in order to build a custom solution, so that the solution is ow

I'm wondering. If the govt pays you to build software, and you use include proprietary libraries in order to build a custom solution, so that the solution is owned by the government, should you open source everything incl. the proprietary components? I get the feeling that is what contractors are trying to avoid so they can keep their competitive advantages. That and hiding horrible code.