extra configuration work. According to Yahoo, the LAUNCHcast music player was not compatible with the Mac OS X or Linux operating systems, however as of February 16, 2009; that wasn't the case anymore. Yahoo stated that following CBS's acquisition, loading the player in Firefox would become possible. Since the relaunch of LAUNCHcast by CBS, users were only required to download the latest Flash Player plug-in (currently Version 10). See external links (below) for Yahoo's help page on system requirements. The requirement still stands with the Yahoo/iHeartRadio merger. Video Before moving to only use Windows Media, early video playback offered the choice of Windows Media Player or RealPlayer, of which the latter was cross-platform and available for Linux. After Windows Media was made the only delivery format, requiring Windows Media Player 6.4 or 7.1 at the minimum, Firefox failed to play videos. To work around this, users had to carefully set up a specialised Windows Media ActiveX extension for Firefox, and (temporarily) tweak the browser user agent with the User Agent Switcher extension to identify as Internet Explorer 6.0 in order to play content. This only worked in Windows and not in Linux. Browser and operating system compatibility issues were largely rectified after the default player was changed to Flash Player, which was cross-platform to the extent that it supported at least Windows, Mac, and Linux. Legal troubles On April 27, 2007, Yahoo defeated Sony BMG in a copyright infringement lawsuit involving LAUNCHcast's personalization features. At issue was whether or not LAUNCHcast's "personal radio station" constitutes an "interactive" service, which requires a negotiated license agreement with a record company, or a "non-interactive" service, which requires a cheaper "compulsory license" from SoundExchange. In an "interactive" service, users can play songs on demand, but with LAUNCHcast they can only influence whether or not a particular song appears in their station. After a six-year litigation, a jury decided that LAUNCHcast was not required to negotiate licenses as an "interactive" service, and that the service's compulsory licenses as a "non-interactive" service were sufficient. The plaintiffs appealed the decision but on August 21, 2009 the United States Court of Appeals for the Second Circuit upheld the lower court's decision, finding that users did not have sufficient control over the playlists generated by LAUNCHcast to render it an "interactive service". See also Yahoo Music AOL Radio References Music Radio Internet radio stations in the United States Radio