For a venerable approach to this, see the source code to the classic computer program "The Colossal Cave Adventure" which implemented a scheme to hide the text in the executable so as to prevent users from dumping the text as referenced in the Literate PDF:

http://literateprogramming.com/adventure.pdf

but you'll need the original source:

https://www.ifarchive.org/indexes/if-archive/games/source/