Comment by econ

It means whatever is convenient. If you are looking to monetize knowledge you would use it like "your car", half way your books are just books you've purchased a copy of, at the other end your car is now mine.

I found an abandoned bicycle 10 years ago. I have since replaced nearly all parts of it. I would give it back if you can prove it is yours but who owns the bicycle of theseus is more of an opinion.

I refer to it as my bicycle.