Permissions 属性

此 API 条目保留标识符、签名、代码块和 PDF 术语的原始形式。

返回从 /Encrypt 字典解码得到的所有者密码权限位

返回从 /Encrypt 字典解码得到的所有者密码权限位

Bit layout: bit3 = Print, bit4 = Modify, bit5 = Copy, bit6 = Annotate, bit9 = FillForms, bit10 = Accessibility, bit11 = Assemble, bit12 = HighQualityPrint.

Wraps the corresponding PDFium API and exposes it as a TPdf instance member so consumers do not have to manage FPDF_DOCUMENT handles directly.

• Always check Pdf1.Active在调用页面作用域操作之前；需要打开文档的方法会引发EPdfError otherwise.
• 文档编辑方法（AddPage / DeletePage / UpdatePage / CreateAnnotation）会让内存中的文档处于脏状态，请记得调用SaveToFile to persist.
• Class methods (LoadLibrary / UnloadLibrary / GetRecommendedV8Flags) can be called without a TPdf instance.

UserPermissions, Password