Patent trolls are firms that buy patents hoping to bring patent infringement lawsuits against major firms rather than to producing goods themselves. Recently, 53 firms such as Google, Microsoft, Ford Motor Company, JP Morgan Chase, Solar City, and Uber have joined the LOT (License of Transfer) Network.13 These companies control about 360,000 patents. If any fall into the hands of a troll, these companies automatically cross-license the patent to all members so that the troll cannot sue them. Ken Seddon, LOT executive director, says that this program is similar to the herd immunity conferred by vaccines. Moreover, the more companies that join, the more attractive it is for additional companies to join. Explain this reasoning.