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Get information about encrypting certificates
First load the document as described in the corresponding how-to article.
Check the value of Encrypted property of TElPDFDocument class to check that the document is encrypted.
If the document is encrypted using X.509 certificates, the EncryptionHandler property of TElPDFDocument contains the security handler which will be used for decryption.
The security handler contains information about recipient groups in the RecipientGroups property. Each group is represented by an instance of TElPDFPublicKeyRecipientGroup class. The information about encrypting certificates is stored in its RecipientInfos property.
