Are there License Restrictions on 3D PDF files?
No. You can use the 3D PDF files as much as you like, for as long as you need, with no recurring license fees. Any PDF files produced using PDF3D technology may be distributed royalty free; the licenses only refer to the content generation software. It is only the 3D PDF generation tool which requires a commercial license. The PDF file itself is normally owned by the person who created it, not the vendor behind the creation tool.