Any Gen living in a Householding, or who were the property of an individual sime;  such as those purchased at Auctions.  Pre-unity all Gens living in a Householding were the property of the Sectuib and were required by law to have papers and tags.

(Source:  First Channel -- Chapter 5)  "Hey—calm down, Kadi!  The papers are all legal.  I made sure of that, and I stamped your tags myself.  If the dealer was too stupid to count his money before signing the papers, that's his problem, not mine.  Besides, he got more than a fair price."   ---- Rimon Farris