It isn't necessary to know all the small print of BIP39 so as to use copyright - but you will surely take pleasure in figuring out a bit about it. This text explains BIP39, the standard that defines how seed phrases are made, and summarizes how BIP32 and BIP44 standards https://ragingbookmarks.com/story19605530/considerations-to-know-about-bip39-word-list-pdf