Located at SELF offset 0x78.
For some reason it was named vendor_id there.
In geohot's makeself it was used as:
Not directly related to Authority ID, but seems to have many simularities with it (vendorid=2nd-9th bytes of authid), seems also related to SM ; LPAR's and their order suggests hierarchy/permission from high (can do everything) to low (lesser abilities).
|0x00000000||?||lv0 / lv1 only before SDK 060|
|0x33000077||?||*ldr / lv0 / lv1 only on SDK 060|
|0x07000001||180||iso spu self's|
|0x01000002||6147||CoreOs / dev_flash files / Games|
Note: first byte is territory value, last byte is guest_os_id.