An appeals court in Hong Kong demanded that a protest song popular during pro-democracy demonstrations be removed from the internet, judging it was a “weapon” to incite violent protests in 2019.

The case has been closely watched for how it would affect tech firms and internet platform operators — a concern raised internationally over the free flow of information in Hong Kong.

Wednesday’s ban comes after a campaign by the city’s authorities against the song, which has seen them demand it be removed from Google’s internet search results and other content-sharing platforms — a request that has been largely rebuffed.

“The government… will communicate with relevant internet service providers, request or demand them to remove relevant content in accordance with the injunction order,” said Paul Lam, the semi-autonomous city’s Secretary for Justice.