In March 2023, "Copyright Registration Guidance: Works Containing Material Generated by Artificial Intelligence" has been released. It states that "copyright can protect only material that is the product of human creativity. Most fundamentally, the term “author,” which is used in both the Constitution and the Copyright Act, excludes non-humans."
But technological tools, including AI, can still be employed if the human had control over the work's expression. In such cases, copyright will only protect the human-authored aspects of the work. For example: Images created with AI are not copyrightable, but the arrangement, selection, or editing by a person may be.