I have not heard the word “Viral Video” ever now; however, according to my research, it seems that it is related to free Internet site. For example, those are blog and e-mail. Also, it has relation with You Tube, and Launch that I often use to watch video and to listen to the music. In addition, I noticed that these sites are all free and anyone can take part in the contributing all over the world. What’s more, we may not know the executive officer of these sites though there is a lot of advertisement. In other words, I think they are not acceptable business on the low. About it, I consider that they are so enjoyable and useful for me, but I am worry about not only the right to use it on the low but also the measure of safety for copylight.