Kindly disregard the bumbling ramblings of the post below. The answer is explained in the first paragraph of the referenced post. I read the other post after I printed this. Please read this post as it's very interesting.
http://www.ironcrown.com/ICEforums/index.php?topic=11282.100
I know nothing of copyrights, publishing, intellectual data laws, etc. But I have experience with producing products while a student and while an employee. As a student, any projects that are made while attending a university are the property of the university. The rationale sucks, but as you are student, the university sort of owns you and all your works and your compensation is an education and course credits. It's worse if you're an employee. If they can prove that you used ANYTHING at all from the university, even if it was taken out of a trash bin*, it is property of the university and they own all rights to whatever creation/idea you created and sold to a 3rd party. The university gets all the money and credit for the item you created. Happened to three of the computer folks I work with. As a senior thesis project, one buddy wrote the entire information database the university now uses. That database was sold off to other colleges and he received $1 USD for his efforts.
As contributing authors to an ICE product, wouldn't the material become property of ICE the instant it is submitted? ICE can therefore print and reprint as they own the material? The author, John Q. Public, can't print off the material he submitted to ICE as his own book, even though he created it. ICE has the copyright to it. He couldn't take his submitted material and make a game called "Public's D100 Game System" and release the book containing only his data, ICE would certainly sue for infringement.
If there is a super quick, 20-words-or-less, explanation why ICE can't print the material and still give credit to all authors, please share. If it's a long, in depth explanation, it's OK. No need to go into details.
* - Yes, this happened a few years back. A facilities management employee used bits from a trash bin to make a snow sweeper to remove snow from the fields without damaging the turf. He did all the work at home, on his own time, and did not use any university resources. The university found out and took over the rights and ownership of the device and he received $1 USD for his work. The device is now used at several universities and professional venues.