|
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 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.
Also, 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.
|
|
|
