On De-Authorizing apps from the Mac App Store

I'm about to de-commission a Mac and would like to know if there is a procedure to de-authorize apps purchased via the mac app store, or is it sufficient for me to de-authorize the computer through iTunes?
Appreciate the help!

If you are planning to sell the Mac or give it to someone you should Deauthorize the Mac in iTunes but you need to also wipe the Mac and just install the base OS and the supplied Apple apps. You should not pass on any apps that you have acquires through the MAS on to anyone else, the End Usr License Agreement does not allow that. Those apps are coded with your account and can be traced back to you if they get pirated.

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