"Held: Google’s copying of the Java SE API, which included only those lines of code that were needed to allow programmers to put their accrued talents to work in a new and transformative program, was a fair use of that material as a matter of law. Pp. 11–36."

Google's statement on sharing ad space / rotating Google Ad ID's to share profits. TLDR: It is explicitly allowed.

generator for legal statments / conditions of use types of things on sites and apps