Section 123 of Evidence Act "Evidence as to affairs of State"
No one shall be permitted to give any evidence derived from unpublished official records relating to any affairs of State, except with the permission of the officer at the head of the department concerned, who shall give or withhold such permission as he thinks fit.
Section 124 of Evidence Act "Official communications"
No public officer shall be compelled to disclose communications made to him in official confidence, when he considers that the public interests would suffer by the disclosure.
Section 125 of Evidence Act "Information as to commission of offences"
No Magistrate or Police -Officer shall be compelled to
say whence he got any information as to the commission of
any offence, and no Revenue- Officer shall be compelled to
say whence he got any information as to the commission of
any offence against the public revenue.
Explanation - "Revenue-officer" in this section means any
officer employed in or about the business of any branch of
the public revenue.