“权利义务相关的”可以翻译为 “related to rights and obligations” 或者 “pertaining to rights and obligations” 。
例如：
This agreement outlines the responsibilities that are related to rights and obligations of both parties.（这份协议概述了与双方权利义务相关的责任。）
We need to clarify the issues pertaining to rights and obligations in this contract.（我们需要澄清这份合同中与权利义务相关的问题。 ）