I'm not getting in on this debate. As you can see from my post count, I'm a lurker. I won't state my side in this argument, so I'm sure that my opinion matters not. However, I won't lurk and allow completely false statements be passed off as truth and read and believed to be truth by the masses.
Your CC package files are considered DERIVIATIVES you cannot copyright a deriviative.
Where does U.S. copyright law say that you cannot copyright a derivative? Perhaps you cannot copyright a deriviative, but I don't know what that is.
http://www.copyright.gov/circs/circ14.html#derivative/U.S. copyright law clearly states that:
A “derivative work,” that is, a work that is based on (or derived from) one or more already existing works, is copyrightable if it includes what the copyright law calls an “original work of authorship.” Derivative works, also known as “new versions,” include such works as translations, musical arrangements, dramatizations, fictionalizations, art reproductions, and condensations. Any work in which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship is a derivative work or new version.
A typical example of a derivative work received for registration in the Copyright Office is one that is primarily a new work but incorporates some previously published material. This previously published material makes the work a derivative work under the copyright law.
To be copyrightable, a derivative work must be different enough from the original to be regarded as a “new work” or must contain a substantial amount of new material. Making minor changes or additions of little substance to a preexisting work will not qualify the work as a new version for copyright purposes. The new material must be original and copyrightable in itself. Titles, short phrases, and format, for example, are not copyrightable.
"To be copyrightable ..." If you cannnot copyright a derivative, how could it
ever be copyrightable? According to you, it cannot. According to U.S. copyright law, it can.
If, and only if, it is different enough from the original work to be regarded as a "new work".
Now, I'll leave it up to you all to debate whether or not new Sims creations are different enough from the original work to be considered "new work". But I won't sit idly by and watch you say that you canot copyright a derivative when you absolutely, one hundred percent can copyright a derivative.
"A 'derivative work,' that is, a work that is based on (or derived from) one or more already existing works,
is copyrightable if it includes what the copyright law calls an “original work of authorship.'"
That's in case you missed it the first time.