Apple has been sued by a Malaysian firm called StreetSpace which claims ownership of a patent related to location based advertising.
The lawsuit involves Apple's iAd mobile advertising service, which uses GPS data to deliver location based advertisement on users' device.
StreetSpace has also sued other wireless advertising services providers including Apple owned Quattro Wireless, Google, AdMob, Nokia, Navteq, Millenial Media and Jumptap.
The Malaysian firm is responsible for developing a remote Internet terminal called Web Station where customers walk-up to this station and access the Internet.
The system uses a technology which helps the company in delivering targeted advertisements to the customers.
StreetSpace has based its lawsuit on a US patent titled 'Method and System for Providing Personalized Online Services and Advertisements in Public Spaces', which was awarded to it in 2005.
The issue might prove a major hindrance for Apple's iAd service, which, according to StreetSpace, uses its patented technology to deliver targeted advertisements based on user's location, profile and usage history.