Tolkien’s works are under active copyright (the Tolkien Estate and HarperCollins). There is of the 2007 novel in most countries (copyright expires 70+ years after author’s death; Tolkien died in 1973, and Christopher in 2020). However, you can obtain verified digital copies through authorized channels: jrr tolkien the children of hurin pdf verified
However, legitimate digital copies do exist. You simply have to pay for them (or borrow them). The “verified” part comes from the source, not the file format.
While I couldn't find a verified, freely available PDF of "The Children of Hurin" due to copyright restrictions, I can suggest some options: Tolkien’s works are under active copyright (the Tolkien
Why can’t you just download the first PDF link from a generic search engine? Here are the common issues with unverified or pirated copies:
Christopher Tolkien compiled the book from his father's various drafts (including The Silmarillion and Unfinished Tales ). Unlike The Silmarillion , which can read like a dry history textbook, The Children of Húrin is written as a narrative novel. You simply have to pay for them (or borrow them)
(specifically the tragic figure Kullervo) and Greek tragedies. : Unlike the more hopeful Lord of the Rings