I'm working on an animated feature (still very pre-production) and I was hoping to use rotoscoping for a few sequences to cut back on production cost and cause it would look neat.

Would I be legally allowed to use copyrighted footage as a source since I'll be animating over every frame or would that still get me sued? I definitely don't have extra cash to shell out for royalties (or a lawsuit...).

Should I just stick with stock footage?

-F☺rd