To those who don't get the humour, there is a DIY source code site for developers called sourceforge.
I was driven there by a term: hypersigil
So I meandered the site and of course had to look up the O.T.O.
There was an amusingly well written, albeit biting comment.
The Book of the Law was written by Aleister Crowley in 1904. Crowley described the book as "received". This, in Occultism, is supposed to mean that it was transmitted to him by some spiritual entity via occult means. (the reader may be interested to check Skepticism).