One of the recording industry’s recent efforts to stem the flow of illegal music downloads on the internet was to issue subpoenas to dozens of American colleges and universities, demanding that the schools turn over the names and addresses of students known to be trading copyrighted material on school servers. But this week, two Boston schools have filed motions to quash the subpoenas, claiming that the industry failed to give the schools a reasonable amount of time to inform their student bodies. One Boston College administrator insists that the motions to quash are not designed to protect students engaged in illegal file trading, but to make sure that the law is followed to the letter.