Copyrights protect the product of creative effort. If you're posting your own material, then copyright doesn't enter into it; if you're posting a derivative of the ODP, then copyright may be involved, regardless of your domain name. To avoid issues you must abide by the terms of the ODP license.
Trademark protects the distinctive identification of the creator. The name "scottishdmoz" might raise trademark issues. If you were using it for, say, a retail outlet for australian percussion instruments, then there's little likelihood of confusion with the California-based web directory. If you're using it for, say, a web directory, then there is much higher likelihood of confusion -- and that is an important consideration.
The ODP changed its name a couple of times -- the original name, "Gnuhoo", aroused trademark protests from both the Free Software Foundation (home of the "gnu" operating system) and Yahoo.
Bear in mind that AOL (a multinational company larger than either the FSF or Yahoo) owns the relevant trademarks. Even if you're totally disinterested in any possible ethical issues, even if you're completely unconcerned about your own personal reputation -- consider the economic cost of responding to just one boiler-plate "cease and desist" order. Bear in mind that domain-name-squatting is in particular bad odor with both the registrars and the courts right now. Ask a lawyer whether you wouldn't be well-advised to pay $6.95 to get a less risky name. And ask yourself if the possibility of causing confusion is really worth the economic risk?