Preserving Embedded Fonts in iText

I have a java application which splits a pdf into sections using itext, then stitches a selection of these up t开发者_开发知识库ogether again. The original pdf has many embedded fonts varying in type (all non-system fonts). When I stitch the pdf's up again, some of the embedded fonts are missing.

For example, this is a clipping from the original fonts list:

This is a clipping from the generated pdf font list:

I am using PdfWriter and PdfReader to copy the pages into the new document, with PdfContent and addTemplate().

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Finally found the answer! The problem was the level of Pdf was set too low:

writer.setPdfVersion(PdfWriter.VERSION_1_2);

I changed this to:

writer.setPdfVersion(PdfWriter.VERSION_1_7);

and now all fonts are embedded correctly.

I actually forgot that piece of code was in there - I had borrowed it from a project I had done in the past.

Lesson learned ;)

I would love to know why this is the case though.