"Material that is in the public domain (this will be the case if all of the authors of a published work died more than 50 years ago) will no longer be subject to copyright protection. Care must be taken to consider the work itself, since if it contains new material, for example, it might be subject to copyright. In general, it is assumed that most of the material used in University of Toronto teaching and research is subject to copyright." U of T Fair Dealing Guidelines, November 2012. For more information on Fair Dealing and Copyright see the U of T guides.