"The single files (or substantial portions of them) are not what's being distributed in this case." If the single files are not being distributed how do we kno

"The single files (or substantial portions of them) are not what's being distributed in this case." If the single files are not being distributed how do we know then, then header has been changed on single files? On the other hand: if somebody received these individual files - they were also distributed... each one of them...