de-register the product keys?
As I've upgrade all my computers to Windows 10 pro, I now have three Windows 8 Pro packs (retail purchase with 32bit and 64bit DVD's) that are redundant. Also have a retail purchase Windows 8 Pro pack product Key.
When I upgraded to Windows 10, I didn't bother 'de-registering' the Windows 8 product keys. Can I still do this and once done can I sell, donate, give away the packs to anyone who wants them?
I Also have two OEM Windows 8.1 DVD's that I no longer need. Again I haven't de-registered the product keys for these. Can I do it for these and can they be used again given that they weren't purchased with a computer (or any parts for that matter).