The following open-source font families provide style equivalents for F1–F7 without legal restriction:
Since these aren't "real" fonts you can download from a font library, you cannot simply install them. Use these methods to fix the display issues: Open the PDF in Adobe Acrobat Pro . Go to Tools > Print Production > Preflight . CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
Analysis and Availability of CID-Keyed Fonts (F1–F7) for Free Digital Typography Analysis and Availability of CID-Keyed Fonts (F1–F7) for
If you want a one-click solution, several open-source projects bundle all necessary CID-keyed fonts that cover F1–F6 (and sometimes F7 mapped to a generic fallback). CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
When a PDF is created and the original font cannot be embedded (or is deliberately omitted to save space), the system substitutes a "base font" and tags it with a simple label like /F1 , /F2 , etc. These are sometimes referred to as or font dictionary keys.
. Instead, they are generic labels used by PDF software to describe fonts that were not properly embedded or were renamed during the PDF creation process.