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ΠΠΎΡΡΡΠΏ ΠΊ ΡΡΠΎΠΉ ΠΊΠΎΠΌΠ°Π½Π΄Π΅
Choose File - Export As - Export as PDF, Digital Signatures tab.
D'oh! You found a bug (text/shared/01/ref_pdf_export.xhp#digital_signature_pdf not found).
Π‘ΠΌ. ΡΠ°ΠΊΠΆΠ΅
About Digital Signatures