I'm pretty sure the patent vlf found is related to Kazaa. This part of the patent application is what leads me to believe that (link: http://ip.com/patent/US8095500):
In order to make the search and download of data from a distributed computing network convenient and user friendly, a Graphical User Interface (“GUI”) 150 may be provided, or this task can be fulfilled using a commonly available Internet browser or other search or browsing interface. The functions of GUI 150 include receiving content requests from users and providing a download progress display that helps users keep track when downloading multiple files over the distributed computing network. The GUI 150 may also allow the user to specify the type of file to be searched, such as text, audio, image, web page or video. The GUI 150 may further allow the user to input a plurality of search criteria, including, but not limited to the following: a. Text File: The search query may contain one or more of a partial filename, keywords, author, file size, the category, and/or text description. b. Audio File: The search query may contain a partial filename, a bitrate (bps), a sample rate (Hz) of the data, file size, content duration, the name of the author or artist, the song title, the genre, and/or the title of the file. c. Video or Image File: The search query may contain a partial filename, the amount and type of compression, the size of the file, the category, and/or the description of the image or video. d. Web page: The search query may contain words contained in the web page to be returned as a search result.