Amazon's Kindle was at the heart of patent-infringement suit brought about by Discovery in 2009. The two companies settled this week.

Amazon.com and Discovery Communications have settled their 2-year-old patent spat.

The two companies filed requests this week to dismiss lawsuits in federal courts in Seattle and Wilmington, Del., reports Bloomberg.

Details of the settlement weren't revealed.

In March 2009, Discovery, which produces the Discovery Channel and Animal Planet, filed a patent infringement lawsuit against Amazon over the Kindle e-reader's electronic security technology.

The Discovery patent in question dates back to 2007 and is called the "Electronic Book Security and Copyright Protection System." Discovery had said it wasn't looking to stop Amazon from selling the Kindle, but instead sought damages, future royalties and legal fees.

Two months later, Amazon fired back at Discovery with a lawsuit of its own, claiming the company infringed on four Amazon patents related to search query and recommendation technologies.

The Discovery lawsuit wasn't the first against the Kindle. Recently, the online retailer's Kindle Fire tablet was targeted by Smartphone Technologies LLC, which claims the Fire infringes on four of its patents.

In 2009, the Authors Guild criticized the Kindle2's text-to-voice feature, which reads books aloud, saying it would harm the audio book industry and not compensate authors and publishers for their work. Amazon later decided to allow authors and publishers to choose whether to add the feature to their e-book titles.