From the WSJ:
The patents at the center of the dispute are broad, and IBM alleges they cover parts of Amazon’s elaborate product-recommendation system. That system shows customers products related to the one they’re looking at, and also shows them other products purchased by like-minded customers. The patents also cover the way Amazon displays advertising on its site to match customer preferences, and how the retailer stores shopping data to build customer profiles.
“Given that time frame, these are very fundamental inventions for e-commerce and how to do it on the network,” said John E. Kelly, IBM’s senior vice president for intellectual property. “Much, if not all, of Amazon’s business is built on top of this property.”
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