"The danger in media concentration comes not from the concentration, but instead from the feudalism that this concentration, tied to the change in copyright, produces"

This quote by Lawrence Lessig is referring to the increasing concentration of media ownership in the hands of a couple of big companies. He is alerting that this concentration of media ownership, integrated with changes in copyright laws, can lead to a form of feudalism. In this feudalism, the few big companies that own the media have the power to control what info is readily available to the general public. This can result in a situation where the public is just exposed to particular concepts and point of views, and is not able to access a wide range of details. This can lead to an absence of diversity in the media, and can restrict the public's ability to make educated decisions. In addition, it can lead to a situation where the public is not able to challenge the concepts and perspectives provided by the media. This can result in a circumstance where the public is unable to think seriously and make decisions based upon their own beliefs and values.