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+ERFA has received explicit permission from the IAU SOFA Board to re-license
+and re-copyright ERFA from SOFA. The email providing permission is shown here:
+
+> The IAU Standards Of Fundamental Astronomy Board approves the
+> relicensing of a changed SOFA library by the NumFOCUS Foundation to use
+> a "Three Clause BSD" license. The changed, relicensed version shall
+> differ from the SOFA version in that all function names shall change to
+> use "era" as a prefix in place of "iau", and that the SOFA Board shall
+> be removed as a copyright holder in the relicensed version.
+
+> Catherine
+> Chair, IAU SOFA Board
+> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+> HM Nautical Almanac Office
+> United Kingdom Hydrographic Office
+> Admiralty Way
+> Taunton TA1 2DN
+> Catherine.Hohenkerk@UKHO.gov.uk
+> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^