Many years ago I have read a novel in Polish SF&F magazine "Fantastyka" (or "Nowa Fantastyka"), where main character job at a moment was to modify existing movies removing smoking and/or drinking from them (mentioned were "Dumbo" and "Casablanca"). Movies were stored in something like light-based memory, constantly refreshed and checked for unauthorized changes. There are no new movies made, only remakes, or movies made out of fragments of other movies (finding relevant fragments is one of jobs of main character).
The organization of the story was rather characteristic: before each section there was short description of trope, with example... and in the plot the trope was usually played straight, sometimes subverted.
One of supporting characters (female) had in Polish translation nickname "Heada" (not sure what it was in original).
Is anyone here able to help me identify this book?