Okay, then.No. They. Are. Not.
It is NOT free. This is a common fallacy because it was first reported that way.
The link you provide is for registered owners who have already purchased the product and the serials are given there so that registered owners may reinstall CS2 without having to reactivate. Adobe has removed CS2 from the activation servers.
That said however, Adobe seems to be unconcerned about others downloading from that link.
Sorry about that. Then I guess they're not.
*wink