IBM (NYSE:IBM) is suing Airbnb (AIRB) for infringing on four patents related to e-commerce.

The tech giant says "enough is enough" after six years of failed negotiations for a cross-license with Airbnb and wants the court to block any further unauthorized use.

IBM has cross-license agreements in place with the likes of Apple and Amazon and previously won $83M in a similar lawsuit against Groupon.

Source: Bloomberg.