
The inspiration for this paper was a lawsuit against OpenAI and related companies filed in 2023 in the United States District Court of the Northern District of California, San Francisco Division. The plaintiffs (authors) alleged, among other things, copyright infringement by using their novels to train AI without their consent. The purpose of this article is to assess, through the prism of Polish law, the plaintiffs' chances of success in a similar dispute hypothetically taking place in Poland. However, due to the limited scope of this paper, its scope was limited to evidentiary issues. This is an interesting aspect, which has been neglected in the doctrine so far, and at the same time it is undoubtedly crucial from a practical point of view. The conclusions of the considerations made will be related to the postulates presented regarding the solution at the legal level of some copyright problems related to the training of AI.