Los modelos de negocio viables pasan por el rechazo al DRM Article. CC by. Download allowed. 2026-06-09T18:47:54Z 2026-06-09T18:47:54Z Creative Commons Attribution 3.0 2009-09-23T08:40:34Z 2009-09-23T08:40:34Z September 23, 2009 at 8:40:34 AM UTC 2009-09-23T08:40:34Z