In a filing last week, DS SolidWorks argues for dismissal of Autodesk's lawsuit. The documents filed with this motion to dismiss are voluminous, and include extensive citations to other cases. This indicates that SolidWorks has decided to invest the necessary resources to defend themselves.
SolidWorks claims that Autodesk is using this lawsuit to "bludgeon" SolidWorks and to achieve the results it was unable to achieve via the US Patent and Trademark Office. Their basic argument is that Autodesk does not own the "DWG" and "real" marks, therefore it has no standing to claim injury from SolidWorks' use of those terms. With regard to Autodesk's claims of unfair business practices and false advertising, SolidWorks argues that Autodesk has not stated why the statements are false, and that in any case the statements in question are not actionable because they are mere "puffery" (a legal term of art for vague and subjective marketing statements).
It's interesting to note that SolidWorks uses Autodesk's own statements in the ODA lawsuit to support the argument for dismissal. For example, in their TRO filing during the ODA lawsuit, Autodesk admitted that the use of non-Autodesk .dwg files is "pervasive". SolidWorks also points out that Autodesk specifically disclaimed their right to "DWG" as a trademark when applying for other trademarks with "DWG" in their name.
I sense that Autodesk's strongest claim is the trade dress infringement claim regarding the so-called "orange rectangle", with the trademark infringement claim regarding the use of "AutoCAD" on SolidWorks' web site also a contender if this goes to a jury. I think there is a good possibility that the remaining claims will be settled or dismissed before it gets to the trial phase.