Umm, there is. Basically, thats the default in most of the world. My recomendation if that is what you want to do, is to put a note in the readme and in LICENSE.txt that says "this project is copyright by me. If you want to use i, reach out to me and if I like you, I will give you a license". Then if you like someone, give them a written statement that you like them, and grant them permission to use your project(s), and under what terms, if any.

Thank you kindly!

There's not a whole lot of point to acquiring Boost licensed software. Of course, they could always acquire me and pay me handsomely!