Section _.14 allows for disclosure of NPI when done in consideration of an actual or anticipated secondary market or similar transaction. I would think that a participation would fall under the "similar transaction" portion of this exception and would be able to be consummated without disclosure or opt-out.
Also, when purchasing consumer loans, but not the servicing rights you would have no customer relationship and no automatic disclosure obligations. However, you would have consumers and if you were going to subsequently share any of that NPI (other than as allowed by section _.14 or _.15) you would have an obligation to provide at least the short form privacy notice to those consumers and provide an opt-out opportunity before sharing.
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Jim Bedsole, CRCM, CBA, CFSA
Opinions expressed are my own, and do not necessarily reflect those of my employer.