Can we draw the following hypothesis from the context?

Context:

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 --

Hypothesis: The clause is said to contain limitations
Yes