The difference and reasoning for licensing in regards to software (and 3d items are software) is due to "tangible" and "intangible". If you sell Stephen King's book it is obvious that you are not keeping the book the book is in hand. But if you give away or sell poser or another software item (including Poser or other software add-on products). It does not mean that you were unable to keep a copy, either on your computer or backed up on disc. The software is "code" and therefore not "in hand".

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo