THotPDF.UseAES256R6 Property

Chooses revision 6 of the standard security handler for AES-256 encryption (CryptKeyLength = aes256). Revision 6 is the PDF 2.0 form (ISO 32000-2) with the iterated SHA-256/384/512 password hash; when False, AES-256 falls back to revision 5, the earlier Adobe extension. Set it before BeginDoc. It needs Version pdf17 or later and switches itself off for older versions

Declaration

property UseAES256R6: boolean read FUseAES256R6 write FUseAES256R6;

Unit

HPDFDoc

Parameters

Return value

Returns no value

Usage notes

• Set it in the security workflow before the page, resource, field or catalogue object concerned is finalised
• Keep object names, field names, resource names and returned handles stable until the document is finalised
• The passwords count as UTF-8, cut to 127 bytes, for revision 5 and revision 6 alike; see UserPassword

Related APIs

• THotPDF
• THPDFPage
• Contents