they do work on a certain level of macro lets put it one way on some copies i noticed dark light throughout the films if you want to keep videos for yourself id buy one if you wanna sell em to yer mates i buy a chipped dvd player or get yours done i also bought a more expensive macro box 48.99 this worked as good as the macro lead i sent it back because it does not disable macro fully as its description i got my money back the macro leads sorted for vcr to vcr ppv off sky digital but dvds all have different levels of protection chow