In November, Twitter disclosed in an amendment to its S1 filing that IBM was demanding licenses for three patents issued in 2006 that it claimed that Twitter was infringing upon. As far as we know, IBM didn’t file a lawsuit against Twitter, and this took place shortly before Twitter held its initial public offering.
This dispute appears to have been resolved, but we don’t know all of the details, and it’s questionable if we will ever learn about them. Here’s what the amendment said about the matter:
From time to time we receive claims from third parties which allege that we have infringed upon their intellectual property rights. In this regard, we recently received a letter from International Business Machines Corporation, or IBM, alleging that we infringe on at least three U.S. patents held by IBM, and inviting us to negotiate a business resolution of the allegations.