CopyTele, or more specifically, its Secure Web Conference Corp. division has sued Microsoft's Skype due to patent infringement. Copytele says that Skype infringed on 2 of its patents, one regarding a "method and apparatus for securing e-mail attachments", and the other for a "portable telecommunication security device." However, CopyTele didn't sue Skype because it was trying to protect its patent portfolio. It sued Skype because it saw an opportunity to generate more money off its patents. Yes, unfortunately, CopyTele is known as a patent troll.