by webb » Thu Jul 12, 2012 2:16 pm
No, your copyright was free, instantaneous and automatic when you first "fixed" your creative work of expression in a tangible form. You own it. You can sue others who violate your copyright.
Similarly, your trademark was free and automatic (at least in common-law countries) when you were the first to use the distinctive logo or name as an indication of source or quality of your particular goods or services. You can enforce your trademark to prevent others from using anything similar on related goods or services in your locale or market, if their use would create a "likelihood of confusion" with your goods.
They could certainly sue you, but your countersuit would be more likely to prevail in court. Also, even if someone were to register a trademark (i.e., federally) after you had been using yours, they could not use that registration to stop you from continuing to use your trademark. They could, however, limit your expansion. This is why the owners of many valuable trademarks hire companies or attorneys to "watch" for related trademarks when applications are filed, so you can notify them of your existing rights, file an opposition to their registration, or even sue to have their registration revoked in your favor.
Add: It may also be worth noting that copyright does NOT protect your idea at all, anywhere. It only prevents others from copying or modifying your creative works of original expression.