The Library of Congress offers an interactive resource that helps students understand what copyright means. The resource called "Taking the Mystery Out Of Copyright" uses videos, slides, and other interactive formats to cover what can be copyrighted, the history of copyrights, common questions and answers about copyrights, and the steps required to get something copyrighted. This website is child-friendly and can be used to help teach elementary students about plagiarism, ownership,giving credit, etc. Furthermore, there is a tool that allows teachers to select a set of standards, grade level, and subject area to check which specific standards are covered by the interactive resource. This resource can certainly help students become aware of the different types of information and media that are out there and how they can be used appropriately.
http://www.loc.gov/teachers/copyrightmystery/?#/steps/