Google’s fonts are the industry standard for free CJK fonts. They are fully CID-keyed compatible.
There are no direct download links for "F1, F2, F3, F4" because these are internal code names, not commercial products. cid font f1 f2 f3 f4 free link download
CID fonts, including those described by F1, F2, F3, and F4 descriptors, are essential for high-quality multilingual typography. When searching for these fonts, prioritize reputable sources and consider the licensing terms. Free fonts are available, but it's crucial to use them responsibly and within the bounds of their licenses. CID Fonts Explained: Finding F1, F2, F3, F4
or "anonymized" names created by PDF export software when the original font information is missing or improperly embedded. CID Fonts Explained: Finding F1