iTunes encryption Password
The entire idea of encrypting something is you can't access it without the password. Passwords are never stored anywhere in plain text. 

Modern password structures mean that only a hash of the correct input is stored.
If you input the correct password, the hashes match; without the password ever actually been stored anywhere at all, only the 'maths' necessary to test for when it is entered correctly.

So, in short, if you don't have the password, you don't have access to the data.
Not even Apple can unlock it for you.