Hello,
Creators of content usually want to hold ownership over the content until complete (and the check doesn't bounce). I think it's a bit of a stretch to say this is a serious collaborative technology. Aside from the whole data mining issue, there is no such thing as "web based" and "secure". I also think it's a point solution in that there are specific files that can be placed in the framework, with that limitation companies cannot get the complete project picture. I can see a group screen share with a call bridge being more effective and secure than this technology. If your security and auditing requirements are more strict there are existing solutions that handle that quite well. I do tinker with the VSR WebGL plugin for Rhino, if I was going to send something out I'd use that before 3D PDF.
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