The CID-keyed font format, when deployed as OpenType/CFF (Compact Font Format), offers significant advantages over traditional font formats, including better performance and memory efficiency compared to older OCF (Open Composite Font) formats.
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Fixing the "CID Font F1, F2, F3, F4" Error in PDFs: Causes and Solutions
Step 4: Convert the PDF to an Image and Back (PostScript Conversion)