How can I transfer or release one of OSX from my Apple ID?

Hi all,
I had a MacBook Air with 10.7.x pre-installed. When I open it, I registered it to my account.
Then I bought a new version of MacBook Air and forward my old one to my colleague. For sure I registered the new one's to my Apple ID too. A year later I upgraded it to 10.8 too.
Now my colleague has some issue and he needs to format and reinstall MacOSX of old version like pre-installed one. But installation does not continue with his Apple Id (for sure). There is no choice for me to release it or re-register...
Question is this : How can I transfer or release one of OSX from my Apple ID and my colleague can registered it on his name?
I seems I have 2x OSX. I can continue to give my ID and install again. But I don't want. (I checked community but issue is not exactly the same, therefore I opened this again)
Any advice?
Thanks,
Cenk

When you sell a machine with Lion or Mountain Lion preinstalled, you need to use Internet Recovery before selling it:
Hold Command + Option + R keys while booting up or restarting and, once connected to Apple's servers, go to Disk Utility and erase the drive. The servers will then automatically reinstall the original system version. That install then will not be associated with your Apple ID and the buyer will be able to reinstall if necessary. You should have also unregistered your machine on Apple's website.
https://daw.apple.com/cgi-bin/WebObjects/DSAuthWeb.woa/wa/classicLogin?appIdKey= 58ef9db8ff4d201409e7270a68e4408ae1678e1618204c476572a1b5e5fb3518&path&language=U S-EN
Sign in, choose the Mac to delete and then click on unregister.

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