Standard Western fonts (like Arial or Times New Roman) use a simple encoding system because the English alphabet only requires a few dozen characters. Asian languages—such as Chinese, Japanese, and Korean (CJK)—require thousands of distinct characters.
The term is not a specific font style like Arial or Times New Roman. Instead, it is a professional font format developed by Adobe to handle massive character sets. CID fonts are most frequently used for East Asian languages (Chinese, Japanese, and Korean) because these languages require thousands of unique characters. cid font f1 f2 f3 f4 free download free
This process often rasterizes or flattens problematic font subsets into standard formats. To help you get this sorted out, let me know: What are you using when this error pops up? Are you trying to view the document or edit it? Do you know the source or language of the original file? Standard Western fonts (like Arial or Times New