Absolutely. One of the most important clauses in our agency's MSA, and one of a small handful I consider non-negotiable, is the clause which says that the IP ow

Absolutely. One of the most important clauses in our agency's MSA, and one of a small handful I consider non-negotiable, is the clause which says that the IP ownership of any work does not transfer until the work has been paid in full. We don't negotiate on that clause, even under threat of losing very large contracts. IP ownership is the only real leverage contract developers have to get paid.