This is a great question (you also reminded me to add choosealicense.com to the licenses section!) but I don't have an answer for you I'm afraid and I don't want to give you bad advice.
However you may find some useful info in this chapter on Non-Open Source Licenses and The Legal Side of Open Source. Hope that helps!
Wow, great resource nonetheless. You've pointed me towards a "Classic Proprietary License" for projects that contain open source code but is not licensable. Thanks for the great article and reply!
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