Stallman gets speakers fees, writes books, and writes software.
His viewpoint is that software should be free, but support, customization, etc are legitimate to charge for. It has proven to be a viable business model.
How does he feel about others copying his books, plagiarizing his speeches, et al?
Personally, if an individual or company wants to join the movement and contribute their efforts (software, ideas, literature), they should be free to do so.
However, it's been long held that America's greatness came about quickly, and eclipsed all other nations, BECAUSE of our strict adherence to property rights and more explicitly, the DOCUMENTATION of property rights (deeds, patents, copyrights, trademarks, et al).
IIRC, these ideas won an economist the Nobel Prize (small praise, these days) for that very assertion.