Cidfont F1 F2 F3 F4 F5 F6

: Tells the PDF reader that the text relies on a composite index mapping system.

If you have ever dug into the internals of a PDF file, examined a PostScript print job, or debugged a corrupted font table, you have likely encountered cryptic placeholders like . These identifiers are not actual font names (like "Arial" or "Times New Roman") but rather internal font handles used by the PDF and PostScript rendering engines.

Using qpdf (command line):

Find the /BaseFont value for each Fx key. Then, either:

It doesn’t immediately match a known major paper title. However, given the terms, you are likely referring to one of two things: cidfont f1 f2 f3 f4 f5 f6

/CIDSystemInfo << /Registry (Adobe) /Ordering (Identity) % or Japan1, CNS1, Korea1, GB1 /Supplement 0 >>

Below is a that defines and uses CIDFonts f1 – f6 (simulating different encodings or CMap usage) and then draws text with each. : Tells the PDF reader that the text

Ensure is checked. Note: This makes the text uneditable, but it preserves the visual look of the text. 2. Replacing the Font