, a note-sharing website owned by textbook rental company Chegg, shut down its service to Cal State University students after its parent company received a cease-and-desist letter from the 23-campus system.

The CSU Office of General Counsel sent a cease-and-desist letter to Notehall on Jan. 4, citing violations of the California Education Code and the California Code of Regulation. allows students to buy and sell notes online.

The letter asked the note-sharing website to stop selling and promoting its product in California and to stop marketing to CSU students.

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