This is not a problem with the end user machines - this is due to hacking of iTunes and it has been going on since 2009 as far as I know, and as referenced above maybe since 2007.
My e-mail notifications today show postings that are new here since the last time I was here or viewed this site - we all know how that works. So, I signed in so I could comment on the post above, and much to my surprise, my account was locked ->
'Dear XXXXXXXXXXXXXXX, |
Click the link below to choose whether you want to reset your password or unlock your Apple ID. |
The link will expire three hours after this email was sent. |
and the embedded link for authorization here |
| etc... |
Questions? There are lots of answers on our Apple ID support page > |
If you weren't trying to reset your password or unlock your Apple ID, don't worry – your account is still secure and no one has been given access to it. Most likely, someone just mistyped their own email address while trying to reset their password. |
Thanks, |
Apple Customer Support' |
 |
OK, so I picked re-enter my password rather than new password, and my account was unlocked. Reading their last statement above, someone obviously tried to log in to my account and used all the password attempts allowed at which point Apple locked my account.
So now I'm wondering if for example, some computer science students in another country, have been passing account information around that was hacked from iTunes or Apple, and this pyramiding cascade of iTunes items theft (I have not seen any posts suggesting apple software has also been dwnlded) is the result of hundreds (or more) of different thieves stealing for themselves or (as internet searches have found in China) selling the stolen merch at reduced prices... This looks like a giant farming project and the it's harvesting of our accounts. Again this appears to have been going on for several years.