Here is copyright-free unofficial libre documentation on Ithkuil language. Ithkuil was invented by John Quijada and published at http://ithkuil.net in 2011 and 2015.
The documentation is currently in progress.
The documentation has explanations in English and Lojban.
Special thanks to these users: la stela selckiku, la gejyspa, Daniel Satanove, Ečnasöfuqt Elaešqumžaubv, Azrael Gnosis.
The core of this document was written in 2013.
Ithkuil and related stuff is discussed in Ithkuil chats in Discord messenger.
THISdenotes the formative (word), to which the affix in question is attached. THIS-UNDECORATEDdenotes the formative before attaching the affix in question. CONTEXTdenotes the current semantic context, environment or universe of discourse, which is described by the current formative and possibly other formatives. ANOTHERdenotes another participant of CONTEXTdistinct from THIS. ATTACHEDdenotes the connected semantic context, presupposition, events or fact mentioned earlier or to be mentioned or assumed from CONTEXT. SPEAKERis the one who says the current text.