BEIJING — The authorities have identified a new threat to political stability in the restive region of Tibet: photocopiers. Fearful that Tibetans might mass-copy incendiary material, public security officials intend to more tightly control printing and photocopying shops, according to reports from the Tibetan capital, Lhasa.

A regulation now in the works will require the operators of printing and photocopying shops to obtain a new permit from the government, the Lhasa Evening News reported this month. They will also be required to take down identifying information about their clients and the specific documents printed or copied, the newspaper said.

A public security official in Lhasa, who spoke on the condition of anonymity, said the regulation “is being implemented right now,” but on a preliminary basis. The official hung up the phone without providing further details.

Tibetan activists said the new controls were part of a broader effort to constrain Tibetan intellectuals after a March 2008 uprising that led to scores of deaths. Since the riots, more than 30 Tibetan writers, artists and other intellectuals have been detained for song lyrics, essays, telephone conversations and e-mail messages deemed to pose a threat to Chinese rule, according to a report issued this week by the International Campaign for Tibet, a human rights group based in Washington.