You can read all about it in a press release from Stanford Law School. Basically, the Fair Use Project and Cyberlaw Clinic at Stanford is assisting the well known Joyce scholar Carol Shloss in her struggle to establish the right to quote from published and unpublished material relating to James Joyce on a scholarly web site about him.
According to the lawsuit, the Estate and its agent, Stephen Joyce, have a history of threatening and pursuing litigation against persons using Joyce's works. As examples, the lawsuit states that the Estate sued sponsors of a global Internet webcast reading of Ulysses that took place on Bloomsday 1998; that event was supported by the Prime Minister, the President, and other politicians in the Republic of Ireland. In addition, the lawsuit contends that although the Estate does not hold copyright over medical records of Lucia Joyce and many letters relating to her, it has consistently leveraged the threat of denying permission to use James Joyce's works if material relating to Lucia Joyce -- of which the Estate does not approve -- is published.Thank the Lord for Lawrence Lessig, is all I can say.