In the literature on this subject, this no-roll-back requirement has been described as illegal and therefore non-enforceable through the WTO dispute settlement system. See for example S. Musungu, “A Conceptual Framework for Priority Identification and Delivery of IP Technical Assistance for LDCs during the Extended Transition Period under the TRIPS Agreement”, Quaker United Nations Office, Geneva, 2007 (available at http://www.quno.org/geneva/pdf/economic/Issues/Priority-ID-English.pdf). Musungu considers the no-roll-back requirement to be an additional substantive obligation for LDCs, one that the Council for TRIPS does not have a mandate to implement.