Cid Font - F1 Family 'link'
. It most commonly appears when a PDF uses large character sets, such as Chinese, Japanese, or Korean (CJK) scripts, or when standard fonts like Arial or Times New Roman are subsetted during export. What is a CID-keyed Font?
CUPS (Common UNIX Printing System) with Adobe CPSI (Configurable PostScript Interpreter) often used the F1-F9 range for CID fonts when printing CJK documents over network protocols like LPR. cid font f1 family
Only use this for final proofs (not editable text): In Illustrator or Acrobat Pro, Convert Text to Outlines . You will lose searchability, but you will see a CID error again. such as Chinese