A reflection on the use of other people's material in our teaching practice. Talking of books, images, videos, webpages... any form of presenting the outcome of human mind. More and more often, due to technological advances, new ways of communication, so-called social networks, off-classroom teaching and study activities, virtual classrooms and campuses... the reality and difficulties of using and sharing materials demand some consideration.

Republication of the article originally published in the University Education section of SEBBM Journal, issue 183, March 2015 (the Journal of the Spanish Society of Biochemistry and Molecular Biology). It is republished here after the journal's original website was taken down.