> You want to be able to edit or delete content, either your own, or, if you are a moderator, other content which turned out to be illegal later (which already

> You want to be able to edit or delete content, either your own, or, if you are a moderator, other content which turned out to be illegal later (which already implies content moderation before allowing content to be published). Or you accept the fact that what you write is a permanent record. (Local admins can delete messages from their servers if there is a problem with the content.) That being said, there are Control messages (RFC 5536 § 3.2.3), and one of the things that they can do is cancel an article (RFC 5537 § 5.3). You'd probably want to authenticate the cancel messages of course: * http://fi.archive.ubuntu.com/ftp.isc.org/pub/pgpcontrol/README.html http://fi.archive.ubuntu.com/ftp.isc.org/pub/pgpcontrol/READ... * https://en.wikipedia.org/wiki/Control_message https://en.wikipedia.org/wiki/Control_message Worth noting that you can't force servers to honour the cancel messages and delete the article on their local storage.