What does it show?
Description of pdf fonts can be found in the pdf.
How to interpret the result?Shows the list of non-embedded fonts.
PDF: Checking the embedded fonts
What does the warning mean?
If the description of the font type is not in the pdf, then alien characters might appear at the place of the original text, or it may be substituted by the photocomposition system of the printing office for other font type, but this could lead to fault also.
Unfortunately, the problem can be corrected only on a machine in which the missing font type is available.
How the problem could be resolved?