Context: In 2005, Apple faced two lawsuits claiming patent infringement by the iPod line and its associated technologies: Advanced Audio Devices claimed the iPod line breached its patent on a "music jukebox", while a Hong Kong-based IP portfolio company called Pat-rights filed a suit claiming that Apple's FairPlay technology breached a patent issued to inventor Ho Keung Tse. The latter case also includes the online music stores of Sony, RealNetworks, Napster, and Musicmatch as defendants.

Question: In what year did Apple face multiple intellectual property lawsuits?
Answer: 2005

Question: What did the 2005 lawsuits accuse Apple of doing?
Answer: patent infringement

Question: What other companies were named in the suit filed by Pat-rights?
Answer: Sony, RealNetworks, Napster, and Musicmatch

Question: On whose behalf did Pat-rights take Apple to court?
Answer: Ho Keung Tse

Question: Which company sued Apple for breach of a "music jukebox" patent in 2005?
Answer: Advanced Audio Devices

Question: Which Apple technology did Pat-rights complain breached their patent in a lawsuit?
Answer: FairPlay