2016 article with more details:
https://arstechnica.com/tech-policy/2016/03/ibm-sues-groupon...It links to the original lawsuit (https://arstechnica.com/wp-content/uploads/2016/03/IBM.Group...) as well as the 4 patents: 5,796,967, 7,072,849, 5,961,601, and 7,631,346