Ask HN: Proprietary license for free software, source code not available.

I've been working on a project which runs on Windows and which I'd like to make available for free, at least for a while. I don't want to release source code, I do want the option to change the license later. Clearly, I don't want to use the GPL or any compatible license. Any ideas as to which one I would use? In addition, I need to ensure it has suitable disclaimers or liability, etc. I would appreciate your thoughts or experience in this area.

TIA!

(Might submit details of the project later, when it's finished and the website is ready.)