I had just posted the other half of that text on another board, EDG.
To repeat that post here, I offer the following:
As a guide to check as to what are considered protected terms for Traveller's Official Traveller Universe, we can check out the Product Identity Declaration section of Traveller T20 Lite. As OGL products, other QLI Traveller T20 products should have similar sections, with similar contents.
Please note that this list is not exhaustive. Just because something isn't here does not mean it's fair game. When in doubt, ask a lawyer.
A number of these have now been included in Mongoose's Traveller SRD. Check there if you see a term that you want to use, to see if Mongoose has opened it up to the OGL. If not, consider the term something you can't use in a commercial product. The jury is still out on whether or not we can use it in fanzines and websites under a Fair Use policy.
Hope This Helps,
Flynn

As a guide to check as to what are considered protected terms for Traveller's Official Traveller Universe, we can check out the Product Identity Declaration section of Traveller T20 Lite. As OGL products, other QLI Traveller T20 products should have similar sections, with similar contents.
Please note that this list is not exhaustive. Just because something isn't here does not mean it's fair game. When in doubt, ask a lawyer.
PRODUCT IDENTITY
In addition to the items specified under section 1e of the Open Game License, the following terms and titles are also reserved as Product Identity. A copy of the Open Game License can be found below.
Traveller, MegaTraveller, The New Era, Milieu 0, Traveller20, T20, The Traveller’s Handbook, Traveller’s Aide, Science Fiction Adventure in the Far Future, Striker, Mayday, Journal of the Travellers’ Aid Society, JTAS, Third (3rd) Imperium, Second Imperium, Ziru Sirka, Rule of Man, Ramshackle Empire, Hive Federation, Two Thousand Worlds, Zhodani Consulate, Aslan Hierate, Vargr Extents, Solomani Sphere, Solomani Rim, Spinward Marches, Sydymic Empire, Khuur League, Julian Protectorate, The Long Night, Sylean Federation, Matarishan Federation, League of Antares, Darrian Confederation, Grand Survey, Rachele Society, Ine Givar, Sword Worlds Confederation, Regency, Reformation Coalition, AI Virus, Virus, Aslan, Vargr, Hiver, K’kree, Solomani, Zhodani, Vilani, Droyne, Luriani, Virushi, Sydite, Drakarans, Clotho, Sheol, Devi Intelligence, Inyx, Inheritors, Lithkind, Ael Yael, Ahetaowa, Bwap, Evantha, Girug’kagh, Githiaskio, Hhkar, Hlanssai, J’aadje, Jgd-ll-jagd, J’sia, Schalli, Tezcat, Addaxur, Answerin, Brinn. Chirpers, Eboken, Humaniti, Solomani, Ursa, Wanderer, Delgado Trading LIC, GSbAG, General Products, Instellarms LIC, Ling-Standard Products, Makhidkarun, Hortalez et Cie LIC, Naasirka, SuSAG LIC, Sharurshid, Sternmetal Horizons LIC, Tukera Lines LIC, Zirunkariish, Zhodane, Zhdant, Lair, Kuzu, Glea, Guaran, Kirur, Sylea, Annapabar, Dukh, Sopater, Khuur, Daramm, Darrian, Regina, Glisten, Travellers’ Aid Society (TAS), Lords of Thunder, Deadspace, Iridium Throne, Amber Zone, Patron Encounter, Casual Encounter, Argushiigi Admegulasha Bilanidin (AAB) or the Vilani Repository of All Knowledge, Behind the Claw, Astroburgers, Church of the Chosen Ones, Coyns, Signal GK, Children of the March, Azhanti High Lightning, Hava-Cola, GDW, Infoscreen, MAE Lines, Yaskoydray, Empress Wave, Black Curtain, Official Traveller Universe, OTU, Charted Space, Gateway Domain, Jonkeereen, Jagd-il-Jagd, Travellers, Galanglic, air/raft, Gcarrier, Scout/Courier, Far Trader, Misjump, High Passage, Middle Passage, Low Passage, Low Berth, Universal Personality Profile, UPP, Universal World Profile, UWP.
A number of these have now been included in Mongoose's Traveller SRD. Check there if you see a term that you want to use, to see if Mongoose has opened it up to the OGL. If not, consider the term something you can't use in a commercial product. The jury is still out on whether or not we can use it in fanzines and websites under a Fair Use policy.
Hope This Helps,
Flynn