The seal — the verse where the poet names themselves inside the work, so authorship travels with it. The license as data rather than prose: three grants never one, the copyright never moving, and the seal always evidence, never a lock. Greek joins the naming strata.
Greek σφραγίς (sphragis, a seal, a signet's impression); poets used the word for the closing verse where they set their own name into a work, so that authorship travelled with it.
The verse where a maker sets their own name inside the thing made, so the making and the credit are never separated afterward. Evidence carried inside the work itself, never a lock placed over it.