Rather than mentioning it in the appointment order it should be a separate agreement signed by employer and employee. The Non Disclosure Agreement (NDA) is governed by the Indian Contract Act, 1872. NDA must be stamped to be a valid enforceable document.
9th July 2019 From India, Madras
This can be done by making an NDA agreement. for assistance in preparation and compliying all labour laws you can contact me.
9th July 2019 From India, Chennai
You can put a clause of non-disclousre facts & figure in the appointment letter. But to hold it in order, you should take a "Fidelity Bond" from Covenant Employee according to the job responsibility of the position.
The imposition of condition in bond should not be an infringement on either Article 19(1)(g) of the Constitution or Section 27 of the Contract Act or otherwise shall be treated void.
12th July 2019 From India, Mumbai