Tool #3: It seems like copyright lasts forever! I use a lot of resources from the National Archives because I know it is in the public domain since it is property of the US government. I always teach my students to document where they received any images or videos that they use. It is important that they know they must give credit. Since we are not profiting off of the company, it is ok that we use it for educational purposes...as long as we only use pieces of a work, not the whole item.