Interoperability between ODRL and MPEG-21 REL. - Josep Polo; Jose Prados; Jaime Delgado (ODRL Workshop, 2004)

Interworking of Rights Expression Languages for Secure Music Distribution. - Josep Polo; Jose Prados; Jaime Delgado (WEDELMUSIC, 2004)

Profiles for Interoperability between MPEG-21 REL and OMA DRM. - Jaime Delgado; Jose Prados; Eva Rodríguez (CEC, 2005)