Hello
I am looking to implement something that would be like a hybrid between a digital signature and a stamp.
The document in question is a work traveller. It is would be used as work instructions, and also gather data on the part being manufactured using Form fields.
In the process, I would also like to have signatures of various operators and controllers. The problem being, the document should still be modifier after each signature (only the part after the signature needs modification, but this is a detail). I understand well that this is not something a digital signature allows.
I have seen, though, that by right-clicking on a signature fields, an option called "certify with visible signature" is proposed. This one allows modification of the document after certifying, but requires more than just clicking the signature field. Is there a way around this ? 
On the other hand, I am aware that there is the stamp option. But I do not like the fact that a stamp can be placed anywhere on the document. I would rather have a field dedicated to it, and in any case I want a password to be asked for each signature or stamp, while different users would be able to sign / stamp with the same user account (shared PC).
Thank you for your advice,
Cyril