Over the past few weeks, an ongoing patent dispute has meant most of the focus in the content delivery market has been on Akamai and Limelight. In the meantime, however, Level 3 has been quietly expanding its CDN services, adding capacity to its network and signing up one large customer after another. In fact, when it comes to CDN patents, Level 3 is the one to watch. In addition to the 50 patents pertaining to content delivery it has pending, Level 3 owns over 80 patents pertaining to content delivery and streaming media technology — including 20 it recently bought from IBM.