It's Normal For Software Companies To Ignore Patents
Professor Mark Lemley is briefly mentioned in the following Forbes article on the widespread practice among software companies to ignore patents.
When talking about the smartphone patent wars, it’s important to recognize that, as Stanford’s Mark Lemley pointed out a few years ago, almost all software companies ignore their competitors’ patents. There are two basic reasons for this. First, there are so many software patents, and they have such unclear boundaries, that finding and negotiating the rights to necessary patents is essentially impossible. And second, patent law awards triple damages in cases of willful infringement. So if a company finds a patent, tries to work around it, and is later ruled to have infringed the patent, it’s on the hook for three times the damages it would have faced it if had never found the patent in the first place.