Section 1275.50 - Restriction of materials of general historical significance unrelated to abuses of governmental power(a) The Archivist will restrict access to materials determined during the processing period to be of general historical significance, but not related to abuses of governmental power, under one or more of the circumstances specified in § 1275.48(a) .(b) The Archivist will also restrict access to materials of general historical significance, but not related to abuses of governmental power, when the release of these materials would:(1) Disclose trade secrets and commercial or financial information obtained from a person and privileged or confidential; or(2) Constitute a clearly unwarranted invasion of personal privacy of a living person; or(3) Disclose investigatory materials compiled for law enforcement purposes, but only when the disclosure of such records would:(i) Interfere with enforcement proceedings;(ii) Deprive a person of a right to a fair trial or an impartial adjudication;(iii) Constitute an unwarranted invasion of personal privacy;(iv) Disclose the identity of a confidential source who furnished information on a confidential basis, and in the case of a record compiled by a criminal law enforcement authority in the course of a criminal investigation or by an agency conducting a lawful national security intelligence investigation, confidential information furnished by a confidential source;(v) Disclose techniques and procedures for law enforcement investigations or prosecutions, or disclose guidelines for law enforcement investigations or prosecutions if such disclosure could reasonably be expected to risk circumvention of the law; or(vi) Endanger the life or physical safety of any individual.