If you received the file from someone else and cannot get it to display, you can force a tool to read the shapes visually.
When a PDF is created, the author should embed the fonts directly into the file. If they fail to do this, your PDF reader will search your local computer for the font. If your system lacks the font, the reader tries to substitute it, which often triggers the error. If you received the file from someone else
For print and archival publishing, export your documents using the PDF/X-1a or PDF/X-4 standards. These formats strictly mandate that all font data must be fully embedded and compliant before the file can be generated. the reader tries to substitute it
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