Distribution is not required for copyright infringement. The creation of a derivative work is a separate right in copyright.
Copyright law has however implemented exceptions in the form of interoperability. The distinction between creating a derivative work, or having two works communicating with each other, is a relative fuzzy one.
Copyright law has however implemented exceptions in the form of interoperability. The distinction between creating a derivative work, or having two works communicating with each other, is a relative fuzzy one.