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When rating_region is an 8-bit field that signals the numerical rating region being described in the Rating Region table.
rating_region [ATSC Semantics]
| region_number | meaning |
| 1 / 0x01 | U.S. Rating region |
| 2 / 0x02 | Canadian Rating region |
| 3 / 0x03 | Taiwan Rating region |
| 4 / 0x04 | South Korean Rating Region |
| 5 / 0x05 | alternate U.S. Rating Region (currently unusable) |
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