Without knowing the context of the quote you posted I can only guess.
I presume someone is copying your listing text, presumably you have reported this to eBay and they have not taken satisfactory action.
The next step is to join the VERO programme, if you are accepted (and I don't know the qualifications) you can pretty much have ANY listing on eBay pulled. Under the VERO program eBay will pull ANY listing that you claim violates your IP rights, you have to prove NOTHING.
When you compose the text of a listing (or the images) you automatically possess the copyright you do not need to do anything at all (a copyright notice accompanying the text is useful but I'm not even sure that you need even this). Copyright is not the same as Trademark or Patent protection which does have to be registered and approved by the government authority charged with this task.
Caveats:
Like I said I don't know any of the details of how to become accepted into the Vero program.
I'm not sure if there is a Vero program in Canada or if you must follow and be governed by US laws.
If you make a claim you do open yourself up to a countersuit, the big boys with their on staff legal departments are better able to defend these suits over a small time seller.
If you make false claims it can bite you if somebody decides to challenge you.
Proving copyright is easy if you write a book and somebody copies it word for word or at least large portions are copied. Proving copyright for a small amount of commonly used text is much more difficult and if the "violator" makes even minor alterations it's next to impossible.
I'm NOT a VERO expert, I have some IP/copyright experience but not so much relating to US laws and further my experience is dated and for example totally predates the DMCA (Digital Millennium Copyright Act).
Not sure if this is any help.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.