Do you mean the WordPress self-hosted software or this site? If you mean the software, this should be covered by the license under which WordPress and derivative works are distributed, ie the GPL -> https://wordpress.org/about/gpl/
Moderator
Jan Dembowski
(@jdembowski)
Forum Moderator and Brute Squad
Yes. You have to promise to be nice and do Good Things™.
*Drinks more coffee*
If you mean the software here then you only have to honor the terms of the GPL license for the software.
https://wordpress.org/about/philosophy/
That’s not the best link (see my coffee reference) but the philosophy page is a good start.
Edit: And Cubecolour beat me to it by 2 minutes. 😉
This is great – thank you!