Padlock/password when trying to restore mac book

hello
I am trying to restore my mac book via the command "R" function I am then presented with a grey screen with a padlock and password box
I have never set a password on my machine and I can't get past this sign
has anyone else every had the same issue ??
regards
Mick

Does it look like this
http://www.bexhillcomputerrepairs.com/apple/apple-mac-efi-password-forgotten/
Then
http://hackaday.com/2013/02/26/mac-efi-pin-lock-brute-force-attack-unsuccessful/
https://jamfnation.jamfsoftware.com/article.html?id=58
http://www.cnet.com/news/efi-firmware-protection-locks-down-newer-macs/

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