According to Microsoft, Legal Intercept is designed to silently record communications on VoIP networks such as Skype.
“Data associated with a request to establish a communication is modified to cause the communication to be established via a path that includes a recording agent.” The data as modified is then passed to a protocol entity that uses the data to establish a communication session,” the description notes.
“With new Voice over Internet Protocol (VoIP) and other communication technology, the POTS model for recording communications does not work,” Microsoft noted in the patent application.
Michael Froomkin, a professor of law at the University Of Miami School Of Law, said that from the patent description it sounds as if the technology would allow Microsoft to do is make Skype CALEA capable. CALEA (Communications Assistance for Law Enforcement Act) requires telecommunications carriers and makers of communications equipment to enable their equipment so it can be used for surveillance purposes by federal law enforcement agencies. “First, making a communication technology FBI-friendly means also making it dictator-friendly, and in the long run this is not good for movements like the Arab Spring,” he said.
http://www.computerworld.com/s/article/9218002/Microsoft_patents_spy_tech_for_Skype?source=CTWNLE_nlt_dailyam_2011-06-29