Not a lawyer. Your claim to copyright the term used by your SaaS depends on the ...

		redleader55 12 months ago \| parent \| context \| favorite \| on: Ask HN: Why buy domains and 301 redirect them to m... Not a lawyer. Your claim to copyright the term used by your SaaS depends on the website you registered, unless you officially copyrighted the term. Someone having all those websites can also claim the copyright, or claim you didn't enforce it by asking the other websites to be removed.

Trademark is the term you meant here I think.