Encryption in PDF documents
When encryption is used in PDF, a security handler must be selected. The Pdftools SDK always uses the standard security handler that, according to the PDF Specification, must be supported by any software that can process encrypted PDF documents.
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For more detailed information about PDF encryption in general, consult PDF Reference, chapter 3.5.
Permissions and passwords in PDF documents
The standard security handler allows access permissions for the document. Up to two passwords can be specified for a document: