RTI Act prohibits information disclosure that is mentioned in Sec.8. No more no less. There is nothing confidentiality or secrecy. Read Sec.8(2)
Notwithstanding anything in the Official Secrets Act, 1923 nor any of the exemptions permissible in accordance with sub-section (1), a public authority may allow access to information, if public interest in disclosure outweighs the harm to the protected interests.
You file an appeal and ask how the disclosure will harm the protected interests?
I find no provision in the RTI Act which enjoins the CPIO to consult another authority for providing the informtion in the form in which it has been sought. How can CPIO of Rashtrapati Bhawan consult the Attorney General in performance of his statutory duty? Either he rejects it giving reasons or gives information.