“Who owns our knowledge?” – The motto of this year’s Open Access Week raises a question that has been at the core of the Open Access movement. The rise of AI and large language model (LLM) training and use brings a new urgency to this question. In this talk, David Rosenthal will share his perspective as expert lawyer on this field. Specifically, he will focus on how today's copyright law deals with the training of large language models with third party content (what is permitted?), how well copyright law is prepared for fairly balancing the interests of rights holders models and those using AI, and what we have to expect from a legal point of view.