Guide portion of this tutorial discussed related details.)}\footnote{In the larger

  Free Software community, it is generally understood that the copyright permissions

  of downstream parties are valid regardless whether someone on their distribution

  chain may have lost their license, because their permissions come from the copyright

  holder, and the license text grants those permissions (as long as one complies with

  its conditions). From this perspective, the GPL's ``automatic downstream licensing''

  provision is a restatement or reinforcement of that obvious rule, not a new or

  specific clause. This intuition is valuable and one can argue it is not unwarranted,

  because, among others, there is a fundamental distinction in US copyright law between

  material object (the copy) and the intellectual content (the work): the physical ``source''

  from where the downstream licensee got the copy doesn't preclude that they get a license

  to the content from the copyright holder(s), i.e. the permissions under certain conditions

  as spelled out in the text.}.