title_body: Are constructed languages intellectual property? Do they ever stop being IP, once people use them? Are conlangs intellectual property? Can they be copyrighted?
  
  The second question is a little more complicated. Does a certain level of public, common usage cause a conlang to become public domain, even when the language was created by a select group?
  
  I know there has been some debate over the Klingon language regarding this, especially since there are a few people who were raised with Klingon as a secondary natural language. But I'm not certain about its legal status. 
  
  For the purposes of location, consider the US generally. If a state is needed, in California.
upvoted_answer: The short answer is that there are no mechanisms in place by which one could credibly copyright, patent or otherwise secure ones language. Works you create about the language (such as a grammar document or a poem) of course fall under the same copyright laws as any other works of their kind and as such generally belong to you, but your language as of now is just as copyrightable as English.
  
  For a long answer, I recommend watching this talk by Sai (founder of the LCS) about exactly this topic.