Look it up at your country's government website. As far as I know, any intellectual property (i.e. original works such as logos, writings, art) in Canada or the US are protected by law without formal trademarking. In other words, as long as you can prove that you came up with the design before anyone else, it is covered under copyright law, and nobody else has the right to use that design to make money. It is always a good idea to formalize something though, so that your intentions are known to anyone who may want to use your logo. A good way to prove you're the original maker of a logo is to make a copy of it on paper, then mail it to yourself in a sealed envelope. DO NOT open the envelope as it will be evidence in court if you ever need to take action. For the most part, if you're the rightful owner, the judicial system will prove to be fair, but trademarking just gives you more of a guarantee. This is a very vague explanation and you should not take my word for it, but go to a government website to get the proper information. There are many other angles and things to consider, so do your research just to be safe.
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