It contains -- the clause itself contains limitations, limited times, authors, exclusive rights and things of that nature. I don't think -- and the petitioners expressly disclaim the assertion that any substantive limitations in the "Promote the- Clause. What the Framers were saying is, we want to give Congress the authority to promote the progress of useful arts and sciences, and --
  Framers were thinking will be the development in the art when is Congress has the authority of useful arts and sciences.
 What the Framers were saying is, we want to give Congress the authority to promote the progress of useful arts and sciences but  We don't sure what were Framers were thinking exactly. What is the reason?
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