Quote - "(but they don't always enforce it according to kawecki)."

I would take that as confirmation that they always enforce it.

Lest anyone think I'm just making stuff up, here is the file hierarchy from an available product at Renderosity.

*Dragon of Plenty_readme
License.txt

RuntimeGeometriesPaloth
Dragon of Plenty5.obj
saddle.obj.

RuntimeTexturesPalothDragon of Plenty

Body and TentaclesMppedJoined2_3.jpg
fruitBump.jpg
fruitColor.jpg
gearBump.jpg
gearColor.jpg
Gold.jpg
GreenBlue.jpg
GreenPearl.jpg
linearLight.jpg
pinkishOrange.jpg

RuntimeLibrariesCharacterPalothDragon of Plenty
Dragon of Plenty.cr2
Saddle and Basket.cr2

RuntimeLibrariesMaterialsPalothDragon Skin
Blue Green.mc6
Gold.mc6
Green Brown.mc6
Green.mc6
Pink Orange.mc6

RuntimeLibrariesPosesPalothDragon MAT Poses
Blue Green.pz2
Gold.pz2
Green Brown.pz2
Green.pz2
Pink Orange.pz2

RuntimeLibrariesPropsPalothFruit and Fruit Basket
Apple Basket.pp2
Apple.pp2
Banana Basket.pp2
Banana.pp2
Grape Basket.pp2
grapes.pp2
Melon Basket.pp2
Melon.pp2
Mushroom Basket.pp2
Mushroom.pp2
Mystery Fruit Basket.pp2
Mystery Fruit.pp2
Orange Basket.pp2
Orange.pp2
Pineapple.pp2*

Notice that the fruit props do not reference anything in the geometry file.

Download my free stuff here: http://www.renderosity.com/homepage.php?page=2&userid=323368