Mesclagem de varios pdf's assinados

Question

Trabalho em uma empresa de medio porte, e tem arquivos de varios sertores e ou empresas diferentes, e no final de tudo preciso fazer uma ata final com todos documentos, porem, a mesclagem nao mantem as assinaturas.

E é inviavel reassinar, e muito menos criar um portifolio de varios pdfs

MikelKlink · Answer

Digitally signed PDFs only allow a small set of operations without invalidating the signature. Merging multiple such signed PDFs definitively is not allowed.

(Strictly speaking the PDF specification only requires this for signatures making use of a MDP variant - e.g. certification signatures - but Acrobat is stricter here and applies nearly the same restrictions to plain, non-MDP approval signatures as to the least strict certification signatures. For details see this stack overflow answer. )

Thus, you have to go for portfolios (or file attachments in general) and/or you have to invalidate or remove the existing signatures.

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