What is the main difference between PDF3D and Acrobat Pro Extended?
Acrobat Pro Extended 9 (from Adobe) is no longer available. Acrobat Pro X, XI plus 3rd party plugins, are commercial applications sold on a per-seat basis allowing set up and generation of 3D PDF files. There are also OEM packaging of Acrobat available for licensing. It assumes you already have a 3D model available, either in some other format for using file converters or by using a screen-grab. If you develop your own software application and wish to add 3D PDF generation for your users, then you could simply export models to an intermediate file format and ask each user to buy Acrobat3D. On the other hand if you integrate PDF3D-SDK inside your application then your users do not have to buy or learn any extra package. With Acrobat X, XI (versions 10, 11), native 3D generation support is no longer available from Adobe. Users must have obtained this option from 3rd parties, including of course PDF3D from Visual Technology Services.