https://support.microsoft.com/pt-BR/infopath/enable-or-disable-digital-signatures
Habilitar ou desabilitar assinaturas digitais | Microsoft Support
Habilitar ou desabilitar assinaturas digitais
assinaturas digitaishabilitaroumicrosoftsupport
https://help.libreoffice.org/latest/pt/text/shared/guide/digitalsign_send.html
Aplicar assinaturas digitais
aplicarassinaturasdigitais