Yes, I used an abundance of caution there. To be honest, I only assume kdenlive is open source, let alone free software, so I'm gonna try not to walk around saying that things are free software. I once heard a very well meaning person say that Adobe Bridge was free (as in speech) software. This was in Portuguese, in which there is no ambiguity between free as in beer and free as in speech. I nearly fell out of my chair!

Thanks for your comment, Celeste!