The Supreme Court seems open to a Texas law aimed at blocking kids from seeing online pornography. But the justices could still send it back to a lower court for more consideration of how the age verification measure affects adults’ free-speech rights.

A majority of the Supreme Court signaled Wednesday that Texas may be permitted to require some form of age verification for pornographic sites, but left open the possibility that deeper First Amendment questions may not be resolved immediately.

The law, meant to shield minors from sexual materials on the internet by requiring adults to prove they are 18, was challenged on First Amendment grounds.