Is money earned from converting medical articles into videos permissible, knowing that there are doubts about the ownership of the articles' copyrights, and that a free video editing program was used with its watermark removed before subscribing to it?

Money earned from converting written texts into animated videos (video) is permissible (halal), and the worker is not required to ask the service requester about their ownership of the articles' rights. However, if they know that the requester does not own them and is infringing upon the rights of others, then assisting them is not permissible. There is no harm in using the free version of the mentioned program.