: These are "virtual" or substitute font names used in PDF encoding to manage large character sets, particularly for multi-language or Asian-script documents.
A quick search for a "free download" of these specific files often leads to confusion. Are these famous fonts? Are they missing files you need to recover? Cid Font F1 F2 F3 F4 Free Download
– In racing or sim communities (e.g., rFactor , Assetto Corsa ), "F1, F2, F3, F4" could refer to racing categories, and "Cid" might be a username or team name. Some modders package custom fonts with those labels. : These are "virtual" or substitute font names
and then exporting it again as a PDF, which can sometimes "re-bake" the fonts into a readable format. Identify and Replace : Use the "File Properties" (Ctrl+D) in Adobe Acrobat Assetto Corsa )