The pdf/a module lists "ASCIIHexDecode", "ASCII85Decode", "LZWDecode" as excluded filters.
The ISO pdf/a spec only mentions LZWDecode as excluded. And the 1.4 pdf specification makes no special mention of the ASCII filters as excluded. How did you arrive at this decision, then?
This may be one of those differences between the draft definition of PDF/A which I worked on and the final definition. I really need to grab a block of time and do some work on PDF/A.
And no one's even touched PDF 1.7 yet.
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