Thank you Chris for your proposal to develop an other portable version (winPenPack already proposed one a few months ago).
I don't mind that you offer some additional furniture or plug-in files with your version, and I might do that too one day in Sweet Home 3D. After all, the license of these files let us distribute them along with Sweet Home 3D so it's not a problem. For your information, I even asked by kindness to Scopia and Kator Legaz if I could distribute their models with Sweet Home 3D, and they agreed.
You should also know that the next version 3.0 will include the features of the Advanced Rendering Plug-in, so I don't know if it will be a good idea to keep that plug-in once this version will be released.
I must confess that I didn't notice it when I first made the portable version, otherwise I would have got permission from you before publishing it
You couldn't notice the trademark at first, since I registered it in May 2009, the same month as the one you started to support Sweet Home 3D (from the dates on portableapps.com site). 
Registering a trademark costs more than 200 Euros in France, and you easily guess it's not the first expense you want to make for a free program!
To distribute Sweet Home 3D Portable, we need permission to use the registered trademark.
First, thank you for asking. I give you the permission to redistribute Sweet Home 3D if you:- copy or move the license information buried in the App/SweetHome3D directory to the root,
- add to the root the 3D licenses bound to the additional 3D models you included (Free Art License for the contributed models, Creative Commons 3.0 Unported license for Scopia models and Creative Commons 3.0 Attribution 3.0 United States license for Kator Legaz models),
- display clearly a link to the source code and the license of your tool (you claim PortableApps.com provides a truly open platform on PortableApps.com home page but found no link to the source code or to the license of your tool), and a link to the source code under GNU GPL that will help users build the version you distribute (for those who don't know about it, I simply recall to Chris the terms of the GNU General Public License under which Sweet Home 3D is distributed),
- do not call it "Sweet Home 3D Portable". Current version of Sweet Home 3D is named "Sweet Home 3D", and as the owner of the trademark I prefer at this time to forbid the creation of any name derived from "Sweet Home 3D".
Sorry if it seems severe, but I will never forget the stupid idea of Sun Microsystems, the inventor of Java, who let Netscape use JavaScript name in the 90's (almost all people who don't program still believe Java and JavaScript are the same thing or something very similar!), and you should also know that a portable version is in the works for Sweet Home 3D itself for a long time already (see Sweet Home 3D roadmap or this request).
I hope you'll understand my point of view.
By the way, as a Java guy, I'm always astonished how the meaning of portability evolved in Windows user's mind.
Personally, a portable application should run on any computer with any operating system, and that's I want to achieve with the implementation of portability I'll program...
Secondly there's the matter of image branding. Almost all of our portable apps have a PortableApps.com splash screen, indicating that they're portable (and also because startup from USB disks is often slow); because Sweet Home 3D already has a splash screen of its own, we can integrate some features of our own onto it and use one splash screen which still announces that it's a portable version.
Your splash screen looks nice but as a conclusion of the previous point, you'll guess that I don't want "Portable" word below "Sweet Home 3D" on the splash screen. I don't mind the USB key and prefer you write "PortableApps.com & SweetHome3D.com" at the bottom, even if I won't add your distribution on SourceForge.net (there's already many files to manage at each release!).I hope my answers are clear. Sorry, if I took a long time to answer but legal stuff needs some thinking (before all if you're not a lawyer!).
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Emmanuel Puybaret, Sweet Home 3D creator
