(Reuters) - Microsoft Corp, Microsoft’s GitHub Inc and OpenAI Inc told a San Francisco federal court that a proposed class-action lawsuit for improperly monetizing open-source code to train their artificial-intelligence systems cannot be sustained.

The companies said in Thursday court filings that the complaint, filed by a group of anonymous copyright owners, did not outline their allegations specifically enough and that GitHub’s Copilot system, which suggests lines of code for programmers, made fair use of the source code.