WASHINGTON

Last week, I asked a lawyer from a libertarian group for a copy of a brief it had filed in a First Amendment case. Sounding frustrated and incredulous, he said a federal appeals court had sealed the brief and forbidden its distribution.

“It’s a profound problem,” said the lawyer, Paul M. Sherman, with the Institute for Justice. “We want to bring attention to important First Amendment issues but cannot share the brief that most forcefully makes those arguments.”

The brief was filed in support of Siobhan Reynolds, an activist who thinks the government is too aggressive in prosecuting doctors who prescribe pain medications.

The Institute for Justice does not represent Ms. Reynolds, and it is not a party in the case. Its submission, made with a second libertarian group, Reason Foundation, was an amici curiae  or friends of the court  brief. It relied only on publicly available materials.