|
Any combination of encrypting, certifying, and applying usage
rights to the same document must occur in the following order. These
services must be invoked within a short-lived process:
Apply encryption (Encryption service) or apply a policy
(Rights Management service) to a document before you digitally sign
the document (Signature service). A digital signature records the
state of the file at the time of signing. Encrypting the document
or applying a policy after you apply a signature changes the bytes
in the file, causing the signature to appear invalid.
Certify a PDF document (Signature service) before you set
usage rights (Reader Extensions service). If you certify a document
after you apply usage rights, it invalidates the usage rights signature,
therefore removing the usage rights from the document.
Digitally sign a PDF document (Signature service) after you
set usage rights. Signing a PDF document after applying usage rights
does not invalidate the usage rights signature.
In addition, you cannot encrypt a PDF document and apply a policy
to the same PDF document. Likewise, you cannot apply a policy to
an encrypted PDF document.
|
|
|
