> It would, in a compulsory rights jurisdiction, because all copyright assignments are either void or revocable at will in such jurisdictions. I didn't believe

> It would, in a compulsory rights jurisdiction, because all copyright assignments are either void or revocable at will in such jurisdictions. I didn't believe this, so I looked at a study of EU copyright law[0]. Rights of authors are split into moral rights and economic rights. Economic rights are transferable as property. Moral rights, however, inure to the author and are inalienable. In some countries, the moral rights include the right to withdraw the work from circulation. This right to withdraw is probably what you are referring to when you say that copyright assignments are void or revocable. The right to withdraw a work from circulation, however, does not come for free. In Spain it is only, "after indemnification of the holders of exploitation rights for damages and prejudice."[1] In Estonia, "The rights ... shall be exercised at the expense of the author and the author is required to compensate for damage caused to the person who used the work."[2] In France, "... he may only exercise that right on the condition that he indemnify the assignee beforehand for any prejudice the reconsideration or withdrawal may cause him."[3] In Romania, the right is "subject to indemnification of any holder of exploitation rights who might be prejudiced by the exercise of the said withdrawal right."[4] In all of the examples I could find, the withdrawal right essentially extinguishes an assignment of the economic rights. So, in a sense you are correct that an assignment is revocable. Practically, however, the author who exercises that right would be liable for damages to the assignee, which could be significant, and the author would not be able to exercise the right if he could not pay for the economic harm. Anyway, this has been interesting and I learned something about European copyright regimes. Thanks. [0] https://www.europarl.europa.eu/RegData/etudes/STUD/2018/625126/EPRS_STU(2018)625126_EN.pdf https://www.europarl.europa.eu/RegData/etudes/STUD/2018/6251... [1] Id. at 134. [2] Id. at 93. [3] Id. at 173. [4] Id. at 301.