If you search for 'Diablo II key grabber', you should get some hits that might point you in the right direction. I haven't used one myself, so I can't recommend any to you, and programs like that are sometimes located on sites that don't necessarily scan everything before it's posted. Not that it matters, because it's encrypted.There are programs 'out there' that will extract the key for you, but I would be very careful using them. Sources I found seemed unsure as to which. The registration key is encrypted in one of the.mpq files in your installation directory, either patchd2.mpq or d2data.mpq. 68 product ratings - Diablo III: Collector's Edition - Diablo 2 keys INCLUDED, Diablo 3 keys used.
