he Internet, the content is streamed to them. They do not own or keep copies of what they're viewing. Streaming is different from downloading. Downloading requires an entire file to be downloaded before it can be viewed or played. With streaming, the user can listen to music or view a video in real time, but cannot store it for later use. When users download from sites such as iTunes, they can store the music files on their computer's hard drive. Spotify is a European site that offers free streaming and monthly subscrip- tions for €10 to download music. Free streaming music is also available at sites such as Pandora Internet Radio, where users select artists as examples of the type of music they want to listen to. Pandora then streams that genre of music to them. Streaming and downloading music has caused the music industry and artists' roy- alties to shrink considerably. Customers now buy their music primarily from vendors such as iTunes, not in the form of CDs, and some users, particularly teenagers, down- load music without paying from sites such as Live Wire and Kazaa. According to an April 9, 2008 survey by investment bank Piper Jaffray, 61 percent of students surveyed download music illegally. Low royalties have forced popular singers to depend on concert sales for the majority of their income. Compression Advancements in Compression Improvements in video compression have been largely fueled by developments in video production hardware, such as faster, multi-processing chips, and by develop- ments in software, such as Adobe's Flash and Microsoft's Silverlight. These new pro- cessors along with superior mathematical algorithms enable larger chunks of media to be compressed more rapidly. Flash is a multi-platform software program that develop- ers use to create animation in electronic games, web-based video conferencing, and video. Flash was previously installed on some mobile devices (not Apple tablets or portable music players, which are compatible only with HTML5) and on many video web sites. However, Adob