Mike and others,
My information comes from page 7, of circular 1, (<
http://www.copyright.gov/circs/circ01.pdf>) published by the US copyright office, which reads, in relevant part (and which can be quoted, as the circular itself is in the public domain in the US):
Copyright Registration
In general, copyright registration is a legal formality intended
to make a public record of the basic facts of a particular copyright.
However, registration is not a condition of copyright
protection. Even though registration is not a requirement for
protection, the copyright law provides several inducements
or advantages to encourage copyright owners to make registration.
Among these advantages are the following:
• Registration establishes a public record of the copyright
claim.
• Before an infringement suit may be filed in court, registration
is necessary for works of U. S. origin. [Empahsis added]
BTW, at present, the cheapest filing fee for a registering a copyright in the US is $35.00 US. If you feel your copyright is infringed, and seek redress in the US court system, the second hour of time of the attorney you hire to represent you is probably upwards from $250.00 US, and pursuit of the case to trial is probably going to require at least a trial retainer fee of $50,000 US.
As to BenDorsey's pondering what to do with meshes, this is a bit harder. However, since his meshes are in GMAX, if it were me, I'd contribute the meshes as free content to the Turbosquid site. It appears to me from the site that Turbosuid might also be a good place for the repository of 3D max meshes, and there is a blender repository, where meshes using that product could be uploaded. In Bendorsey's case, given the number of Bridges I've seen carrying his name, perhaps a college of engineering might welcome his collection for part of their library.
To paraphrase the old conundrum about trees in the forest, "IF a copyright exists on an object, but no one enforces the copyright, or the copyright is deemed unenforceable, is there still a copyright?" The practical matter about copyright is, given the costs of enforcement actions in the US legal systems, very, very few, if any, pieces of Trainz content are going to be worth enforcing the copyright. In the US, if it's not registered, it's not enforceable anyway.
It would to me, that except for licenses from entities outside the trainz community, such as those required in the US by CSX and UP, that the issue of copyright can pretty much be a matter of common sense. If a deceased or departed member of the community was free with the use of his meshes and other items during his period of participation, then it can pretty well be assumed that he would have continued to be the same way. If the member took the time and effort to apply restrictions, then accept and abide by those restrictions. The fact is, creation of content is, on the whole, as inexpensive an endeavor as one chooses to make it, and there is a technological component to some of these things, anyway. In ten years, the advancement of hardware and software technology will make it so that a mesh made brand new, and pushing the envelope of TS2012 will be blasé and dated, and perhaps contain sufficient flaws that it is better to create a new mesh, anyway.
ns