US online retail giant Amazon has filed a lawsuit against Discovery Communications alleging it infringed four of Amazon's e-commerce patents, The Wall Street Journal reported on Tuesday.
The newspaper said the suit alleges infringement of patents covering search engine and recommendation technology by an e-commerce site run by Discovery, an operator of cable-television networks based in Silver Spring, Maryland.
It said the suit was filed last week in US District Court in Seattle.
Amazon's suit comes after Discovery filed a patent infringement lawsuit against the Seattle, Washington-based online retail company in March over its popular electronic reader, the Kindle.
Discovery, in the suit filed in a US District Court in Delaware, claimed Amazon violated a patent it registered in November 2007, and said the Kindle infringes Discovery's intellectual property rights.
Discovery said Kindle violates its development of a digital rights management scheme -- the way Amazon protects the books it sells for the handheld product.
The Journal also reported that Amazon had filed counterclaims in connection with Discovery's suit.
(c) 2009 AFP
Explore further: King Controls Sues KVH for Patent Infringement