How can you sign a field if you've marked it as read-only?
Paulo
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul and Jenny
Ryan
Sent: Thursday, July 24, 2008 2:34 AM
To: itext-questions@lists.sourceforge.net
Subject: [iText-questions] Signing with iText gives invalid sig when "mark
read-only Signed" event set
Hi,
We're investigating usage of Acrobat Professional 8.0 to design a "Staff Leave"
form with multiple signature fields (employee, supervisor and a certifying
signature). The following high-level steps have been followed in order to
demonstrate the problem I'm encountering:
Within Acrobat Professional:
1. Create form template. In the properties of the "employee signature" field,
I click on the "Signed" tab and set "Mark as read-only" to a list of specified
fillable fields.
2. Enable usage rights so that users can save their filled in forms to disk.
3. Add non-visible certify signature allowing form fill-in.
Using Adobe Reader:
4. Open the form template, fill in the fields and save to disk
Using iText:
5. Sign the "employee signature" field
Observations:
- The above steps cause Adobe Reader to cry about "Signature is INVALID; The
document has been altered or corrupted since the signature was applied" on the
"employee signature" field.
- If I use iText to verify the signed form, it's fine.
- If I don't set the "Signed" event (field selection) property on the "employee
signature" field at step 1 above, the signature will be perfectly valid at step
5 above via Adobe Reader.
- If I use Adobe Reader to actually sign the "employee signature" field at step
5 with the "Signed" event set, it shows the signature is valid and locks (read
only) the fields specified.
I was hoping to utilise the field list from the "Signed" event tab to
programmatically loop over and set to read only if iText didn't already honour
these signature properties. It's of no use if the signature appears invalid
though via Adobe Reader though.
Regards,
Paul
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