Can a nonprofit advocacy group keep a “for the public benefit” settlement agreement private?

An interesting question (see article link below): can a nonprofit advocacy group that sues a company or industry group then settle the suit with a settlement agreement the terms of which are private?  I haven’t researched the law on this; however, it seems to me that as the nonprofit’s charter or right to exist as a nonprofit is in some manner dependent on it acting at least in part for the “public benefit” or at least for the benefit of some of the public, such a settlement arguably would need to be court-approved and the terms publicly disclosed.  That answer seems even more correct in light of the beneficial tax status that the nonprofit receives, and/or if the nonprofit also receives taxpayer money.  For the article about deals or settlements between nonprofits and businesses, Click Here.