On behalf of Adobe Systems Incorporated ...
You have heard wrong
! Adobe is absolutely not
providing free copies of CS2!
What is true is that Adobe is terminating the activation servers for CS2 and that for existing
licensed users of CS2 who need to reinstall their software, copies of CS2 that don't require activation but do require valid serial numbers are available. (Special serial numbers are provided on the page for each product download.) See <http://forums.adobe.com/thread/1114930
You are only legally entitled to download and install with that serial number if
you have a valid license to the product!