Who Owns What
Copyright
The Material
The lessons, the Majors, the Library, the Dictionary, the drawings and the calculations are the work of Cabanga Africa (Pty) Ltd, Botswana, and are protected by copyright.
What You May Do
Read it, run the calculators on your own business, print a page for your own use, and quote a short passage with the source named. Teach from it inside your own company where your own people are the ones learning.
What You May Not Do
Republish it, sell it, run a paid course from it, or feed it into a product of your own without a licence. If you want to teach it formally, that is what the licensing page is for, and the answer is usually yes.
The Drawings
Every illustration and diagram on this site was drawn for it. None of it is stock, and none of it may be lifted out.