It kind of depends - in some jurisdictions, for example, interoperability requirements is a sufficient defense against copyright infringement, i.e., if you've built your product so that interoperating with it requires [re]using copyrighted parts, then it's okay to do so (up to the extent required for interoperability) even if you explicitly forbid it.

Sane laws such as that automatically prevent issues such as this Java API dispute and also things such as the attempts to block interoperability for coffee machine "pods" by requiring a copyrighted magic string and using DMCA to prevent others from using it.