SQLite is open-source, meaning that you can make as many copies of it as you want and do whatever you want with those copies, without limitation. But SQLite is not open-contribution. In order to keep SQLite in the public domain and ensure that the code does not become contaminated with proprietary or licensed content, the project does not accept patches from people who have not submitted an affidavit dedicating their contribution into the public domain.
All of the code in SQLite is original, having been written specifically for use by SQLite. No code has been copied from unknown sources on the internet.
I noticed this today when I had a keyboard macro write out my password in Notepad and then got quite surprised by the warning, even if it apparently has been around a few years already.
Doing the same in e.g. Notepad++ does not trigger any warnings though.
It's not likely that life will survive long enough to form civilizations that close to a black hole. It has probably fed like this many times before already.