> *There were periodic challenges to the absolute authority of the king: **the main sources of contention being over the rights** of religious
> minorities (Jansenists and Protestants); and the rights of the
> parlements.*
> 
> Source: Marisa Linton: Choosing Terror, p. 27.

I approximately understand the meaning of the sentence: the two main sources which opposed the official ideology of the absolute authority of the king in France in the 18th century stemmed from religious minorities and parlements. But what's meant by "being over the rights" in the clause?