Fonts must be TrueType
and installed on the machine where reports are rendered. If fonts are not fully embedded
in the report, and they are not present on the machine where report is previewed, the PDF reader will use fallback mechanism to substitute them.
Also the used font must have support for the symbols visualized by the report. For some languages yuo may need to use a Unicode font as Arial Unicode.
For more details about the font requirements, please check Design Considerations for PDF Rendering
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