Support for multiple pdf document with signature

I have a question about signatures.
Does the PDF specification support the combination of multiple pdf documents into one pdf document with the following constraint:
- each individual pdf document has been signed (by an X.509 certificate),
- the individual documents can come from different sources, so they have to be 'included' or merged into the final pdf,
- the final pdf document should not change the signatures of the individual documents.
So each part of the document should maintain the integrity of the individual components and the signature of the individual comnponents are still valid.
Does the pdf specification support this feature?
With kind regards,
Ernst Jan

What you want is called a PDF Package (or Portable Collection in the PDFRef) and is new in PDF 1.7. You can try it out with Acrobat 8.
Leonard

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