ROT13-UTF-8 is a semi-backwards-compatible encoding for text data.
ROT13-UTF-8 replaces the characters represented by bytes 0x41-0x4D, 0x4E-0x5A and 0x61-0x6D, 0x6E-0x7A in UTF-8 with characters U+004E-U+005A, U+0041-U+004D and U+006E- U+007A, U+0061-U+006D, respectively.