you can download and install like Arial or Helvetica. Instead, it is a technical placeholder used during the PDF creation process. Google Groups What is a CIDFont? "CID" stands for Character Identifier
Adobe does not charge for reading CJK text. The official includes free downloadable CID Font Packs . cid font f1 f2 f3 f4 free download free
Licensing and legal considerations
The Mystery of CIDFont F1, F2, F3, and F4: What They Are and Why You Can’t "Download" Them you can download and install like Arial or Helvetica
Since Adobe created the CID format, they are the primary source. they are the primary source.