California Code, Labor Code - LAB § 6394

The preparer of an MSDS shall provide the department with a copy of the MSDS on each hazardous substance it manufactures.The preparer may transmit the MSDS to the department in either paper or electronic form. In the electronic filing of an MSDS, it is the responsibility of the preparer to protect any trade secret information contained in the MSDS during transmission to the department. Upon receipt by the department of the MSDS, it is the responsibility of the department to protect any trade secret information.