Are you currently running picture out of pro tools, to print your stems? Curious to hear what your workflow is and I think many people on this board will benefit to hear the correct way to do things...Try that on a big project with picture changes, a whole team that need the be in the loop - like orchestrators, music editors, directors...and how do you deliver safely to the music editorial/picture department?
what Charlie says is absolutely the only way not to get into legal trouble, to carry a vast amount of redundant data, to not have to re-calculate sync-points in cues that aren’t effected by picture changes, but have now a changed start-time. I can g on, but you might get my point?