We now know a little more about the Netscape patents that Microsoft bought from AOL. It’s believed that the patents that Microsoft either bought outright or acquired a license for over a billion bucks include:
Patent No. 5657390, Secure Sockets Layer (SSL), which has since been transformed into Transport Layer Security (TLS). SSL/TLS sets up an encrypted communication channel between Web browsers and servers. It’s used in practically every Internet financial transaction
Patent No. 7478142. Packing Web-browser based applications This describes how to package applications that are delivered over the Internet and then runs inside a Web browser. You could argue that this covers all Web 2.0 technologies.
You get the idea. These are all essential Web technologies.