Copyright
There has been a big issue with copyright laws. Many people use the music they listen to, pictures, articles, essays into the their own work to prove a point or to express an opinion, for example, many people use content in videos, such as the ones on youtube, that's not their own to make their video more entertaining. To do this without getting slammed for breaking any laws you must follow some guidelines, such as the ones in this prezi, that we looked at in our class. Content that you get from other people to use in your own work are followed under free use. Free use is where you can use other peoples content without being criticized for breaking copyright laws, but free use goes out the window when your content doesn't give the author any recognition for the use of their content. So as long as you cite your sources, give credit to the author, using content of others should be fine.