Royalty Free licence

I think I understand the agreement, but just want to be sure. I see the site has "PRO sound efefcts and non PRO sound effects".

Quick questions:
a) I assume the PRO sound effects are the ones with the orange star icon at the top left?
b) I assume that I can reuse the sound effects if they are not PRO sounds in my pc game, which would be part of a sound effect in my game? Which the game itself will eventually be sold on the internet.
c) I assume that for non PRO sounds, the only price I need to pay is the $5 or so for the sound? etc: for this sound:
http://www.pond5.com/sound-effect/25603728/thunder-storm-loud.html

I would just pay the amount to add to cart?? Is this correct? Nothing after that? etc no royalties

I assume this is a PRO sound effect:?
http://www.pond5.com/sound-effect/8622850/cafe-pecs-small-town-southern-hungary-loud-speech-some-kitch.html#1

whereas this is non PRO?
http://www.pond5.com/sound-effect/25603728/thunder-storm-loud.html

hi, upon actually checking your link examples i want to say that the first link is not a pro sound effect, it's just that the username is like that (prosoundfx). could just stand for 'professional sound effects', not pro as in p.r.o. (performance rights organisation). i doubt anybody is registering his sfx with an actual p.r.o.

the star you mention means it's part of the new membership thing. so you get a special price on it if you have a subscription or something like that.

to people that know better: do step in to further clarify :D