Capcom Sues Koei Tecmo Over Patent Infringement

Tuesday, August 26th, 2014

Closed GAME out now at JAST USA!

Look for us on OpenCritic!

Share this page

Great Physical Editions at Physicality Games!

Check out our friends across the pond at

We are proudly a Play-Asia Partner


Ads support the website by covering server and domain costs. We're just a group of gamers here, like you, doing what we love to do: playing video games and bringing y'all niche goodness. So, if you like what we do and want to help us out, make an exception by turning off AdBlock for our website. In return, we promise to keep intrusive ads, such as pop-ups, off oprainfall. Thanks, everyone!


Capcom vs. Koei Tecmo Lawsuit Capcom vs. Koei Tecmo Games Lawsuit

File this under “weird patents and lawsuits”: Capcom has sued Koei Tecmo for making expansions to video games. The company behind several games with bucket loads of expansions believes that Koei Tecmo has crossed the line in how they have expanded their games, particularly the Warriors franchise.

From the Sankei article (translated):

The lawsuit concerns Capcom’s patent of a system that, when operating a game that is a sequel in a series, makes it possible for those who can fetch save data from a previous game in the series to play as additional characters and in new scenarios. Koei Tecmo’s PlayStation 2 and 3 games in the “Samurai Warriors” and “Dynasty Warriors” series use a similar system, so Capcom claims their patent has been infringed.

Sankei also reports that Capcom is seeking up to 10% of the approximately ¥9.7 billion (roughly $93 million USD) in total sales. It was also reported that Capcom is looking to halt sales of the games in question.

While it didn’t appear in the original Sankei article, a second patent also appears to be causing concern. This other patent concerns a rumble feature that alerts you to nearby enemies. Koei Tecmo has rejected both claims, stating that “(trans.) There is truly no patent infringement.”

Dynasty Warriors 8 Xtreme Legends Complete Edition | Capcom vs. Koei Tecmo Games Lawsuit

Undoubtedly one of the games in question.

If Capcom wins, it’s unclear how this will effect DLC and expansions–past, present and future. The patent was filed back in 2002. It might only effect physical media, since digital wasn’t as big back then. It might also just relate to how the data combines with a save file in a specific way. As for the rumble feature, it’s tough to say either way.


Special thanks to Will Whitehurst for the translation.

About Jeff Neuenschwander

Jeff has been a supporter of the website and campaign since the beginning. Joining in for E3 2012, he worked his way up the ranks quickly, making it to the Editing Manager post at the beginning of 2013. Jeff has a wide variety of tastes when it comes to gaming and pretty much likes anything that is quirky, although his favorite genres are Action, Platforming, and RPG. Outside of gaming, Jeff is a musician, being trained as a trombonist for Jazz and Classical music, and holds a degree in Sound Recording.