Principia Discordia, the sacred book for worshippers of Eris [...] has been reprinted by Ronin press, which is claiming a copyright to the work.
The Principia Discordia, written by Kerry Thornley and Greg Hill, was released into the public domain when it was first published by the authors in 1965.
...the simplistic style in which they are written is partly explained by the fact that the editors, having to meet a publishing deadline, copied the information off the back of a packet of breakfast cereal, hastily embroidering it with a few footnoted in order to avoid prosecution under the incomprehensibly tortuous Galactic Copyright laws.
It is interesting to note that a later and wilier editor sent the book backwards in time through a temporal warp, and then successfully sued the breakfast cereal company for infringement of the same laws.
Oh, the irony linking to a web version of the most definitely still in-copyright RatEotU.