Answer:
Regulation CC does not subject mobile or RDC deposits with respect to funds availability. Unless there is a state law or regulation, funds availability on RDC and mobile RDC check deposits is a contractual matter. At some point, the Fed may amend Reg CC and apply its availability requirements on RDC/mobile deposit, so it may be good idea to model your availability for these checks after your policy regarding deposits of actual checks via tellers and ATMs.
Under what circumstances are you considering whether a "legal copy" might be required? If you are referring to a mobile deposited check that is returned unpaid, you are not required to provide a substitute check or indeed any copy of the check unless your depositor asks for one (or your contract calls for it). Providing a non-legal, but legible copy would be a good practice. Otherwise your customer may contact you for information about the check.
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