This latest salvo in the three-way battle between Lodsys, Apple, and third-party developers comes less than a week before Apple kicks off its annual Worldwide Developers Conference. On Tuesday, , iOS 5, at a Steve Jobs-led keynote. On its site, Lodsys said that it moved its litigation timetable up "in response to Apple's threat," so that it can "preserve its legal options."

Filing suit in Texas is unsurprising, as that particular district is often considered to be friendly to plaintiffs in intellectual property disputes. Legal blog that the companies sued by Lodsys include, among others, The Iconfactory, Quickoffice, and Illusion Labs; in an interesting move, Lodsys alleges that the violation of two of its patents occurs in not just iPhone apps, but Android and Mac apps as well. At present, it appears that at least a few of the developers who received letters from Lodsys have escaped this round of lawsuits; several of the named defendants are based outside of the U.S.

The legal action follows a series of back-and-forth claims and counterclaims by Lodsys and Apple. In , Apple maintained that the company "is undisputedly licensed to these patents and the Apple App Makers are protected by that license." Despite Apple's position, Lodsys has gone ahead and , stating that it has been engaged in confidential discussions with Apple and that "there was clearly disagreement on the interpretation of the license terms of Apple's agreement."

On its Website, Lodsys also says that it has sent a letter to Apple containing its full legal position, but cannot publish the communication, as it contains confidential information from Apple. has reached out to Apple for comment, but has not received a reply as of this writing.

Lodsys seems pretty sure of its position however. The company has promised that to any developer that it has accused of infringement if it is determined that Apple's license covers third-party developers. Then again, that fee may pale next to any costs incurred during a protracted legal battle.