Licence Requirements to protect source Code

We are using Glade Interface Designer for a Medical Device Display. What should be done in terms of licensing such that we can protect our source code. Our sole requirement is that we do not want to share our source code at any point of time even though we are using open source tools.

The XML files can be under any license that is compatible with the LGPL, version 2.0 or later, just like any source code that links against GTK. You can use whatever license you want, as long as you comply with the GTK licensing terms

You should ask a lawyer for legal counsel.