CMap (Character Map) resources are used to unidirectionally map character codes, such as a Unicode encoding form, to CIDs (Characters IDs, meaning glyphs) of a CIDFont resource. CMap resources, like CIDFont resources, include a /CIDSystemInfo dictionary that specifies /Registry and /Ordering strings that must match for compatibility between the two resources. In other words, a CMap resource can be used with a CIDFont resource only if their /Registry and /Ordering strings match.
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