: When a PDF is generated, the software may rename the original font (like Arial or Helvetica) to something generic like CIDFont+F1 .
A PDF editing program (like Adobe Acrobat or Foxit) tells them these fonts are missing. cid font f1 f2 f3 free download link
: Font Squirrel (fontsquirrel.com) is another excellent resource for free fonts. You can search for "CID font" or similar terms to see if F1, F2, and F3 are available. Font Squirrel allows you to download fonts for free for both personal and commercial use. : When a PDF is generated, the software