“Yesterday, we received word from Rob Gloess of Computer LogicX, the company behind the Mix & Mash and Mix & Mash LITE applications for iOS, that he had received legal documents threatening a patent lawsuit over the use of an ‘upgrade’ button in the lite version of his application linking users to the App Store where they could purchase the full version,” Eric Slivka reports for MacRumors.

“The patent in question was filed in December 2003 as part of series of continuations on earlier patent applications dating back to 1992. The patent is credited to Dan Abelow, who sold his extensive portfolio of patents to holding firm Lodsys in 2004,” Slivka reports. “Computer LogiX is not the only App Store developer being hit with threats of a lawsuit, as Cult of Mac notes that James Thomson, the developer behind PCalc, has been hit with a similar notice.”

Slivka reports, “Thomson has reached out to Apple for guidance, and it remains to be seen how things will play out. According to Thomson, the patent holder is demanding that a license be negotiated within 21 days or a lawsuit will be filed.”

Read more in the full article here.

[Thanks to MacDailyNews Reader "Brawndo Drinker" for the heads up.]