According to the page at Smith Micro,

Quote - "Poser Pro Game Dev includes a 5GB library of 3D characters, clothing, props and scene elements that you can export for delivery in your game."

This tells me that the 5GB of included content doesn't require a special license for game dev (good selling point), but you will need a separate game dev license from each vendor whose content you intend on using in your game, because only that vendor can decide whether their content is allowed to be used in games. 

For 2D games that only use sprites (2D animated images) the standard EULA should apply to most purchased content, since geometry and other assets can't be extracted from an image, and most commercial content allows the use in commercial products (animations, web comics, etc). In that case you would only be bound by the usage limits that come with whatever content you're using (ie: most free poser content generally doesn't allow for commercial use in 2D or 3D). 

At least, this is how I'm understanding it.