You need to encrypt your document first, providing "Open" and/or "Permissions" password and save it to the disk. Then you reopen this PDF. It will ask you for the "Open" password ("Permissions" password also allows you to open it). After that you can digitally sign it with certificates. This PDF can be signed with as many signatures as you want, but each signer, in order to open it, needs to know the password. All content of the document, including signatures, will be encrypted.
The only issue is that when I:
1. encrypt document with password
2. use password to open document
3. digitally sign it by entering my digital password........then after that the system tries to get me to save another copy immediately.......is this correctly happening ?
Further locking the editing of the rest of the sheet becomes a complication. Any thoughts on that one?
I can't do locking of the printing or editing of the sheet after i have encrypted and signed it. Trying to do so, wipes out out signatures. Yes, it is a great fullproof to have people be unable to change something someone has signed but if there is an ammendment, can't the creator reserve that right and in an automated sense notify the signers of the rights of the author ?
Maybe I am looking for too much but, it would be great to know if that is the reality of the whole event.
When you digitally sign a PDF Acrobat always saves signed version. That's because of the way signing process works. You can save signed PDF with the same name and the signed version will replace the previous one on disk.
As to "Further locking the editing of the rest of the sheet becomes a complication", I do not quite understand what you mean. If this is further explained in your next post then you need to apply all permissions the first time you encrypt document before signing. You cannot change permissions after signing, because permissions are part of the signed content and changing them breaks the signature.
I too, would love to be able to solve what I believe is similar problem.
How do I add a password after it has been signed?
It's absolutely and completely impossible, by design, and by intention. You must set security before signing. (Or stick it in a PDF portfolio, which are designed to hold files that can't be themselves modified).
Really technical details if you're interested:
1. Signatures record info about EXACTLY how the file is, now.
2. When a signed file is opened, the signature info is checked so we can see if the file has changed.
3. It's possible to have an "incremental update" which breaks the signature but all the original info is still there, so the changes can be "peeled off".
4. When a file is secured, every bit of it is changed using the password.
5. So, when a file is secured, all the original info is lost. (If it wasn't, the unprotected info would still be there in the file).
6. So, when a file is secured, it can't do an incremental update and all signature traces are lost.