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If you do your best effort to determine whether a trademark exists, you will limit your liability but if you do find something and use the trademark anyway you will increase your liability if that's discovered.

If multiple companies are sharing the trademark and any of them have semi sentient legal teams, they likely have some sort of agreement in place (but you have no way of knowing). Failure to do so would greatly weaken the trademark claim.

> ...potential trouble only depends on an adversary's willingness to litigate,

In order to protect your trademark, you have to be willing to litigate.

> Is it such a minefield that it isn't even worth bothering?

Is the name so critical to your idea that it is worth bothering?

The last thing you want to be doing is saying, no no, not .com .io. People will just get confused. Also, because of how most of the search engines work, you may wind up pushed down the results unless someone adds 2-3 extra terms to find your specific brand. For example, an overly dramatic example, but pick Microsoft, with all their history and branding out there regardless of if you could use their name in a brand, would you really want to compete against it?

So even though you might be able to trademark it and get a domain, it doesn't make it worth it. Pick something totally unique that you can stand alone as a brand on. Otherwise you will spend a lot of money setting up marketing differentiators.

Trademarks are domain specific. If your business is significantly different that an average person would not be confused then you should be ok.

Although your point is correct, I think you could have elaborated better for those unfamiliar with this territory. The basic legal premise is that a trademark is being infringed only if its use of similar terms causes confusion for potential customers or clients, which by its nature requires that the offerings under the mark be conceivably similar in nature or industry. Other important factors are any logos, graphics, or colours being used in the marketing material. A further consideration is how naturally unique the trademark is, such as whether it would be reasonable to assume that the same mark could have been conceived independently for another industry. In this latter sense, trademarks are similar to patents.

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If multiple software companies have successfully trademarked the exact same single word, does that matter or not? (They're all sharing it already.)

Yes. As someone who owns a trademark, I can tell you it does matter. Pick a new name.

I would guess that all of these matter by degree, and potential trouble only depends on an adversary's willingness to litigate, but am hoping for some help or guidance in what is a complicated (and frustrating) aspect of our business.

Trademark owners must defend their trademarks against infringement. Expect litigation, every time.

Ask HN: Domain/trademark issues