If you have full copyright on your software or if your program includes components that were licensed to you under permissive open source conditions the distribution licence can be freely selected:
Do you want to allow recipients (other people, from other organisations) to modify your software ?
- No: In such case you are outside the scope of open source distribution. You can adopt any other licence or invent your own proprietary licence.
Please note that - even modified by the creation of a derivative - the source code of some specific components of your program (especially those licensed under LGPL or MPL) will stay distributed under their primary licence.