f you are planning to show copyright images within the confines of your classroom then your usage more than likely falls within the scope of educational “fair use.” Mind you, more and more educators are making their (or their students) presentations available online, and this practice raises some important copyright issues. If you make your PowerPoint publicly accessible on the Internet without the express written permission of the authors of the copyrighted images,
then you have most likely infringed on copyright protection.

To help you avoid infringing on copyright protection, we have prepared an extensive list of Internet sources for public domain images, with an eye towards the humanities. Please check individual images you find at these sites to determine if there are any no restrictions on usage :