The article from the FTA between Singapore and Thailand:
ARTICLE 10 Disclosure of Confidential Information
Nothing in this Chapter shall require any Party to provide confidential information, the disclosure of which would impede law enforcement, or otherwise be contrary to the public interest, or which would prejudice legitimate commercial interests of particular enterprises, public or private.
And the same from SAFTA(Singapore and Australia):
Article 11.12 Disclosure of Confidential Information
No provision in this Chapter may be construed as imposing on the Parties the obligation to provide confidential information of which the disclosure may be an obstacle to the observance of laws or otherwise be damaging to the public interest, or that may injure legitimate trade interests of state and private enterprises.