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.
Incorrect encoding is used for TrueType font [name] The symbolic TrueType font [name] is inconsistent with font dictionary The symbolic TrueType font [name] may not contain encoding entry specified. It has been removed. More than one encoding in symbolic TrueType font CMap for font [name]
6.3.7 - ISO 19005-1 PDF/A Specification:
All non-symbolic TrueType fonts shall specify MacRomanEncoding or WinAnsiEncoding as the value of the Encoding entry in the font dictionary. All symbolic TrueType fonts shall not specify an Encoding entry in the font dictionary, and their font programs' “cmap” tables shall contain exactly one encoding.
NOTE: This requirement makes normative the suggested guidelines described in PDF Reference 5.5.5.