Going to the website and doing a little bit of searching. It doesn't seem like they say you can't use the cad files. They do mention that you can use them "so long as the Trademarks are used properly." I would look at it similarly to referencing UL details in a set of documents where you must place "Reprinted from the Online Certifications Directory with permission from Underwriters Laboratories Inc."
I think they are just trying to protect their information and designated as their property.
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Todd Brautigam Assoc. AIA
Project Professional
EV&A Architects, Inc.
Henderson NV