The Fonts area of the Preflight dialog box lists all fonts used in the document—including fonts applied to overset text or text on the pasteboard, and fonts embedded in EPS files, native Adobe Illustrator files, and placed PDF pages—and determines whether the font is installed on your computer and available. Selecting Show Problems Only shows fonts that fit into the following categories:

Missing fonts

Lists fonts that are used in the document but are not installed on the current computer.

Incomplete fonts

Lists fonts that have a screen font on the current computer but not a corresponding printer font.

Protected fonts

Lists fonts that cannot be embedded in PDF or EPS files due to license restrictions.

Make sure that the fonts used in the document are licensed, installed, and activated either on your computer or on the output device.