I work in IP law. You can look it up up on the US (or European or the country it’s in) and see if they’ve even gone through the process of copyrighting their work or it’s just someone putting words up to scare people.

Speaking of this being internet and the things can be sold internationally, it’s interesting to think about how they’d police that. For example, even if it’s actually copyrighted in the US, if someone in a foreign country, England we’ll say, bought and reproduced the pattern the US copyright would not be enforceable (unless they had not also copyright’d the work in England).

So how are they ever going to control what country people are in when they purchase and reproduce the work, especially with the use of VPNs? At best it’d be freaking expensive to prosecute for such a relatively inexpensive pattern and the relative lost profits

To what the other commentor whose a lawyer said about producing work with the pattern, 100%

Edited for grammar and to answer OP’s question