Creating and verifying signature and certification

Hi experts,
we are developing a PDF based supply chain process to collect some chemical data. Process description:
- Company creates an interactive form
- Company sends the form to the business partner
- Business partner fills out the form
- Business partner sends the form back
We create the PDF and process the received PDF in ABAP.
Now we have the following questions / problems:
- How to certify the PDF that will be sent out (without user interaction)
- How to sign the PDF based on the logged on user before send out (without user interaction)
- How to verify the signature of the business partner (if it is valid and it belongs to the business partner)
Could you please help us?
Thanks and have a great day.
Thomas

Hi Thomas & Experts,
I am also facing similar problem and while doing validation of the signature, the Reader prompts "IdentityUnverifiable" and the certificate is invalid. Any one kindly knows how to solve this problem ? The ADS has been configured with SSL connection on the server and the same certificate has been installed.
Appreciate them greatly.
Thanks~!
Regards,
Adrian

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