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Compliance Issue:
Embedded Font Programs
What does this mean?
The most common reason for this failure is that not all PDF/A creation products respect the requirement to embed the 14 Adobe base fonts as per Note 2 below.
How can I fix it?
Open your PDF file in Solid PDF Tools and then File | Save As PDF/A. If possible, this will correctly embed the required fonts in your PDF/A file. This process works fine for most common fonts including the Adobe base fonts but may fail for proprietary fonts that require licensing.
6.3.4 - ISO 19005-1 PDF/A Specification:
The font programs for all fonts used within a conforming file shall be embedded within that file, as defined in PDF Reference 5.8, except when the fonts are used exclusively with text rendering mode 3. A font is considered to be used if any of its glyphs are referenced in any of the following contexts:
-- the Contents stream of a page object;
-- the stream of a Form XObject;
-- the appearance stream of an annotation, including form fields;
-- the content stream of a Type 3 font glyph;
-- the stream of a tiling pattern.
Only fonts that are legally embeddable in a file for unlimited, universal rendering shall be used.
All conforming readers shall use the embedded fonts, rather than other locally resident, substituted or simulated fonts, for rendering.
NOTE 1: As discussed in PDF Reference 5.2.5, text rendering mode 3 specifies that glyphs are not stroked, filled or used as a clipping boundary. A font referenced for use solely in this mode is therefore not rendered and is thus exempt from the embedding requirement.
NOTE 2: There is no exemption from the requirements of 6.3.4 for the 14 standard Type 1 fonts. Type 3 fonts are exempt from the requirements of 6.3.4 because the manner in which Type 3 fonts are defined ensures that they are always embedded within PDF files, although the mechanism used to embed them differs from that of PDF Reference 5.8.
NOTE 3: The requirements for font program metadata are described in 6.7.10.
NOTE 4: As stated in 6.3.5, font subsets are acceptable as long as the embedded font programs provide glyph definitions for all characters referenced within the file. Embedding the font programs allows any conforming reader to reproduce correctly all glyphs in the manner in which they were originally published without reference to possibly ephemeral external resources.
NOTE 5: This part of ISO 19005 precludes the embedding of fonts whose legality depends upon special agreement with the font copyright holder. Such an allowance places unacceptable burdens on an archive to verify the existence, validity and longevity of such claims.
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