The thing that commenters over at Ars haven't picked up on - this patent is only infringed if the customer wears the headphones without playing music. Noise cancellation with added music - OK, there's prior art for that. Turn the music off - it becomes patentable technology.
The claim states that Bose is on the hook because their documentation states that you can use the headphones without music for noise cancellation only, which induces their customers to infringe Bose's patents.
How is that legit? How can not adding music create a patentable technology?