For each PDF/A-1 validation issue we try to explain what it means and, if possible how to resolve it. For a more technical explanation of the issue we quote the related section of the ISO 19005-1 PDF/A Specification.
The document contains fonts that are not correctly identified or embedded.
How can I fix it?
Use a PDF creation product that correctly identifies and embeds all fonts in use. We recommend Solid PDF Creator Plus.
6.3.2 - ISO 19005-1 PDF/A Specification:
All fonts used in a conforming file shall conform to the font specifications defined in PDF Reference 5.5.
For the purposes of this part of ISO 19005, multiple master fonts shall be considered a special case of Type 1 fonts; any requirement explicitly stated with regard to Type 1 fonts shall be implicitly required with regard to multiple master fonts.
NOTE: It is the responsibility of the writer to ensure the conformance of all fonts. This part of ISO 19005 does not prescribe the manner in which font conformance is determined.