> ## Documentation Index
> Fetch the complete documentation index at: https://docs.artbucket.io/llms.txt
> Use this file to discover all available pages before exploring further.

# 0007: Expiry is a date, enforced where bytes leave

> Accepted, v0.8.

## Context

A license that expires is only as good as the moment the asset stops being
served. A nightly job that flips a status is a day late at best, and does
nothing about copies already embedded around the web.

## Decision

Expiry is `rights.expires`, a date. An asset's state is derived from it on
every read, never written by a job. `/a/{id}` serves only approved, unexpired
assets out of embargo; an expired or archived one answers `410`. Public
caching is capped at an hour, and never past the end of the last day of use.

## Consequences

* An expiry takes effect at the origin on the day, and in caches within the
  hour, without anything running.
* Embeds break on time, which is the point.
* A CDN in front that ignores `Cache-Control` defeats it; purging through the
  CDN's API is the upgrade.