I've consulted legal department in my company, and they've said pretty much the opposite - if software and serial numbers come from official Adobe page, then the license is granted, and software can be legally used. Read EULA carefully.
Official Adobe blog also admitted that this interpretation - CS2 for free - is valid.
Mylenium you are so sure here, so I've thought best option would be to ask the Office of Competition and Consumer Protection about that case - it's government organization in my country suited to give clear answer, when consumer is in doubt. Waiting for response, now (might take few days).