I would be interested in reading through Aeritas' patents
According to their website:
"Aeritas' principals pioneered the mobile barcode space. The Company has an extensive patent and intellectual property portfolio that spans 30 countries over five continents. The company's patented techniques, already in use, are revolutionizing new paperless transactions for sports, concert and event ticketing, airline, train and bus tickets and boarding passes, mobile payments, retail coupons, prepayments and customer loyalty promotions, and a wide range of other uses."
It appears their main focus is mobile tickets and coupons. As opposed to using a camera phone to scan a 1D or 2D code to connect directly to the mobile Internet -- ala NeoMedia's patents.
They could have an effect on Gavitec, Mobiqa, and other mobile ticketing companies.
Best,
Sean