Some documens have large size after converison into PDF/A format. To reduce file size for these documents its necessary to define a strategy of fonts removing. This enumeration declares a strategies which can be used to optimize fonts usage. Every strategy from this enumeration has sense only when flag OptimizeFileSize./pdfformatconversionoptions/optimizefilesize is set....not the real width of symbol(glyph), real width for this symbol...0 and later viewers use the glyph widths stored in the font dictionary...