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Use
certificates to encrypt documents and to verify a digital signature.
A digital signature assures recipients that the document came from
you. Encryption ensures that only the intended recipient can view
the contents. A certificate stores the public key component of a digital
ID.
When you secure a PDF using a certificate, you
specify the recipients and define the file access level for each
recipient or group. For example, you can allow one group to sign
and fill forms and allow another to edit text or remove pages. You can
choose certificates from your list of trusted identities, from files
on disk, from an LDAP server, or from the Windows certificate store
(Windows only). Always include your own certificate in the recipient
list so that you are later able to open the document.
Note: If
possible, encrypt documents using certificates from third-party
digital IDs. If the certificate is lost or stolen, the issuing authority
can replace it. If a self-signed digital ID is deleted, all PDFs
that were encrypted using the certificate from that ID are forever
inaccessible.
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