Luis de Marcos, Carmen Pagés, José-Javier Martínez, José Antonio Gutiérrez, Juan-Manuel de Blas, José María Gutiérrez. Digital Rights and e-Payment in e-Learning - Completing the Learning Object Lifecycle. In Joaquim Filipe, José Cordeiro, Bruno Encarnação, Vitor Pedrosa, editors, WEBIST 2007 - Proceedings of the Third International Conference on Web Information Systems and Technologies, Volume SeBeG/eL, Barcelona, Spain, March 3-6, 2007. pages 540-544, INSTICC Press, 2007.
Abstract is missing.