Share and allow to copy! I found that lot of people use to upload files, images, videos to the Internet. Some of those materials are very interesting and could be useful for example for students. But how would they know they can use it in work? Have you ever heard about Creative Commons? Creative Commons is a non-profit organization that enables the sharing and use of creativity and knowledge through free legal tools. All you have to do is to choose your license here: http://creativecommons.org/choose/?lang=en and add the code for example to your webpage! Let's share our creativity and knowledge! Read more about licenses: http://creativecommons.org/licenses/?lang=en