What is Perpetual Edict?

Legal Definition
In Roman law. Originally the term "perpetual" was merely opposed to "occasional" and was used to distinguish the general edicts of the pnetors from the special edicis or outers which they issued in their judicial capacity. But under Hadrian the edict was revised by the jurist Julianus, and was republished as a permanent act of legislation. It was, then styled "perpetual," in the sense of being calculated to endure in perpetuum, or until abrogated by competent authority. Aust Jur. 855.
-- Black's Law Dictionary