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