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Trademark is a very messy and complicated subject. If you have very realistic concerns, talk to a lawyer who specializes in that field. Forums are great for knowledge, but I don't know of any practicing lawyers on here who specialize in that field.
From what I understand:
As soon as you start to give value to a certain name, logo, etc.... you have a defacto trademark for it. You can make an even better claim by putting the little superscript "TM" next to your logo, brand name, etc... You don't HAVE to register your trademark to get legal protection, but it can help. Now, protecting your name outside of your industry is much harder than witin the industry. An example of this would be Fannie Mae (the homeloan organization) and Fannie May (the candy store). They have names that are very similar, but are in completely different industries, and the use of the name for the one, doesn't really damage the other. However if they were in competitive industries, the one who can prove prior art will be able to get the other shut down.
As Forrest stated, protecting your trademark overseas can get VERY difficult. Usually the only way your going to be able to defend yourself from that one, would be by getting a lawyer and going after their registrar, as opposed to going at them directly.
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