15 C.F.R. § 995.26
(2) Software certification. Conversion of NOAA ENC data to other formats must be accomplished within the constraints of IHO Technical Resolution A3.11: “ENC/SENC Distribution Option” (incorporated by reference, see § 995.2)—in particular, paragraph three:
Distributors who are to supply the SENC service must operate under the regulations of the issuing authority. The onshore ENC to SENC conversion must be performed using type-approved software.