Managing Metadata Visibility in PDFs

Curtis Chau

更新日期:6月 9, 2025

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元數據類別中顯示什麼內容？

元數據對於能夠打開 PDF 的任何人都是可見的。這些詳細信息包括以下項目：

// Assign metadata properties to a PDF document
Pdf.MetaData.Author = "John Doe";  // The author of the document
Pdf.MetaData.Keywords = "Key, Word";  // Keywords associated with the document
Pdf.MetaData.CreationDate = DateTime.Today;  // The date the document was created
Pdf.MetaData.ModifiedDate = DateTime.Now;  // The date and time the document was last modified
Pdf.MetaData.CustomProperties.Add("Test", "val");  // Custom properties for additional metadata
Pdf.MetaData.Producer = "test";  // The software used to produce the document
Pdf.MetaData.Subject = "test metadata";  // The subject of the document
Pdf.MetaData.Title = "test";  // The title of the document
Pdf.MetaData.Creator = "test";  // The original creator of the document

// Security settings for the PDF
Pdf.SecuritySettings.UserPassword = "ironuser";  // Password to open and view the PDF
Pdf.SecuritySettings.OwnerPassword = "ironowner";  // Password providing full permissions, including editing

// Assign metadata properties to a PDF document
Pdf.MetaData.Author = "John Doe";  // The author of the document
Pdf.MetaData.Keywords = "Key, Word";  // Keywords associated with the document
Pdf.MetaData.CreationDate = DateTime.Today;  // The date the document was created
Pdf.MetaData.ModifiedDate = DateTime.Now;  // The date and time the document was last modified
Pdf.MetaData.CustomProperties.Add("Test", "val");  // Custom properties for additional metadata
Pdf.MetaData.Producer = "test";  // The software used to produce the document
Pdf.MetaData.Subject = "test metadata";  // The subject of the document
Pdf.MetaData.Title = "test";  // The title of the document
Pdf.MetaData.Creator = "test";  // The original creator of the document

// Security settings for the PDF
Pdf.SecuritySettings.UserPassword = "ironuser";  // Password to open and view the PDF
Pdf.SecuritySettings.OwnerPassword = "ironowner";  // Password providing full permissions, including editing

' Assign metadata properties to a PDF document
Pdf.MetaData.Author = "John Doe" ' The author of the document
Pdf.MetaData.Keywords = "Key, Word" ' Keywords associated with the document
Pdf.MetaData.CreationDate = DateTime.Today ' The date the document was created
Pdf.MetaData.ModifiedDate = DateTime.Now ' The date and time the document was last modified
Pdf.MetaData.CustomProperties.Add("Test", "val") ' Custom properties for additional metadata
Pdf.MetaData.Producer = "test" ' The software used to produce the document
Pdf.MetaData.Subject = "test metadata" ' The subject of the document
Pdf.MetaData.Title = "test" ' The title of the document
Pdf.MetaData.Creator = "test" ' The original creator of the document

' Security settings for the PDF
Pdf.SecuritySettings.UserPassword = "ironuser" ' Password to open and view the PDF
Pdf.SecuritySettings.OwnerPassword = "ironowner" ' Password providing full permissions, including editing

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當僅設置擁有者密碼時，用戶可以完全訪問 PDF 元數據，包括查看和修改所有文件屬性的能力。
當僅設置用戶密碼時，只有擁有密碼的人才能打開 PDF。用戶可以查看元數據屬性，但修改元數據受到限制。

[{i:(Adobe Acrobat Pro 允許用戶通過提供 UserPassword（如果設置了）來編輯 PDF 元數據。相比之下，其他 PDF 查看器如 Foxit 要求用戶提供 OwnerPassword 以編輯 PDF 元數據，此外還需要 UserPassword 來打開和查看 PDF。）}]