Fonts are all active (exceptions)
This check makes sure that all fonts that are referenced in the document are currently active on the Mac and available to be used by InDesign. Exceptions can be made.
To see a list of missing fonts choose InDesign Type menu > Find/Replace Font.
Fonts listed with a warning symbol alongside are missing:
To activate fonts on your Mac we recommend using professional font management tools such as Extensis Suitcase, or Font Book, which is a free font management tool that comes with your Mac.
Fix this problem by finding and activating the fonts used in InDesign or in some cases by substituting for other fonts. Exceptions can be made.