Signature seems valid, but form was modified.. ?!?!

i'd imagine i'm wrong somewhere...

anyway, if modify signed document...

here procedure :

1/ in designer, create simple forms, 4 fields (myform.pdf) :
- name (textfield)
- amount (textfield)
- signature field (for document certification)
- signature field (for form)

2/ acrobat, certification, , save form
(myform-certified.pdf) then, quit

3/ acrobat, reopen certificated form (myform-certified.pdf)
, set fields (like standard form user) :
- name : martin
- amount : ***25,0
sign (and save as) document, second signature field...
here, seems ok, , have normal , secure signed
document (myform-certified-25e.pdf)...

4/ now, reopen, these 1 (myform-certified-25e.pdf)
select amount field, , change :
example "***25,0" "***25.000.000.000,0" ;-)
whithout leaving field, let's go in file menu, ,
simple "save as", , save document (myform-certified-25me.pdf)...

5/ if open these last one, signature seems valid, , amount
field set "***25.000.000.000,0" !!!

if signature properties, green , valid !!
but, never signed 25 millions amount !

what's wrong ??

i don't know if bug... anyway there main interface problem...

nota: example doesn't works if dont't certify document...

my acrobat 7.02 , used cryptographic token
i can post files examples...

oh my!
i ran through process described , came same results (just using acro self sign certificate kicks).
when first did sign , save -before x-ing out of doc- signature fields showed changed , thinking okay. however, it's on re-open scary stuff happens , shows okay , valid.
i imagine bug -can't imagine adobe has nefarious motives here. please submit big , important issue when send in!
thanks post. i'll bit more diligent in designing forms signatures now.
jennifer

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