密码、安全性和元数据

VB C#

using IronPdf;

// Open an Encrypted File, alternatively create a new PDF from Html
var pdf = PdfDocument.FromFile("encrypted.pdf", "password");

// Get file metadata
System.Collections.Generic.List<string> metadatakeys = pdf.MetaData.Keys(); // returns {"Title", "Creator", ...}

// Remove file metadata
pdf.MetaData.RemoveMetaDataKey("Title");
metadatakeys = pdf.MetaData.Keys(); // return {"Creator", ...} // title was deleted

// Edit file metadata
pdf.MetaData.Author = "Satoshi Nakamoto";
pdf.MetaData.Keywords = "SEO, Friendly";
pdf.MetaData.ModifiedDate = System.DateTime.Now;

// The following code makes a PDF read only and will disallow copy & paste and printing
pdf.SecuritySettings.RemovePasswordsAndEncryption();
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key");
pdf.SecuritySettings.AllowUserAnnotations = false;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;
pdf.SecuritySettings.AllowUserFormData = false;
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;

// Change or set the document encryption password
pdf.SecuritySettings.OwnerPassword = "top-secret"; // password to edit the pdf
pdf.SecuritySettings.UserPassword = "sharable"; // password to open the pdf
pdf.SaveAs("secured.pdf");

Imports System
Imports IronPdf

' Open an Encrypted File, alternatively create a new PDF from Html
Private pdf = PdfDocument.FromFile("encrypted.pdf", "password")

' Get file metadata
Private metadatakeys As System.Collections.Generic.List(Of String) = pdf.MetaData.Keys() ' returns {"Title", "Creator", ...}

' Remove file metadata
pdf.MetaData.RemoveMetaDataKey("Title")
metadatakeys = pdf.MetaData.Keys() ' return {"Creator", ...} // title was deleted

' Edit file metadata
pdf.MetaData.Author = "Satoshi Nakamoto"
pdf.MetaData.Keywords = "SEO, Friendly"
pdf.MetaData.ModifiedDate = DateTime.Now

' The following code makes a PDF read only and will disallow copy & paste and printing
pdf.SecuritySettings.RemovePasswordsAndEncryption()
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key")
pdf.SecuritySettings.AllowUserAnnotations = False
pdf.SecuritySettings.AllowUserCopyPasteContent = False
pdf.SecuritySettings.AllowUserFormData = False
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights

' Change or set the document encryption password
pdf.SecuritySettings.OwnerPassword = "top-secret" ' password to edit the pdf
pdf.SecuritySettings.UserPassword = "sharable" ' password to open the pdf
pdf.SaveAs("secured.pdf")

Install-Package IronPdf

密码、安全性和元数据

IronPDF为开发人员提供了强大的PDF安全选项，支持自定义和设置PDF元数据、密码、权限等。通过IronPDF的密码、安全性和元数据选项，您可以创建符合PDF文档需求的自定义权限和安全级别。这得益于对 SecuritySettings 和 MetaData 等类的运用。一些选项包括限制PDF文档不可打印、将其设置为只读、128位加密以及PDF文档的密码保护。

设置自定义元数据的方法是实现 MetaData 类，以此访问各种 PDF 元数据选项，并使用您自定义的值进行设置。这包括更改作者、关键词、修改数据等。设置自定义安全设置包括能够设置自定义用户和所有者密码、打印权限、只读模式等。

设置 PDF 密码、元数据和安全性的 5 个步骤

var pdf = PdfDocument.FromFile("encrypted.pdf", "password");
System.Collections.Generic.List metadatakeys = pdf.MetaData.Keys;.
var metadatakeys = pdf.MetaData.Keys;
pdf.MetaData.Author = "Satoshi Nakamoto";
pdf.SecuritySettings.MakePdfDocumentReadOnly("秘钥");

为了开始自定义PDF文档的安全性，您必须首先加载现有的PDF或创建一个新的。在这里，我们加载了一个现有的密码保护的PDF文档，其中输入了打开PDF文档所需的密码。加载 PDF 后，我们将使用 pdf.MetaData.Keys 获取 PDF 的当前元数据。若要删除现有的 PDF 元数据值，请使用 RemoveMetaDataKey 方法。要开始设置新的元数据值，请使用 pdf.MetaData.metadataField（例如 pdf.MetaData.Keywords），然后将其赋值为新值即可。诸如 Title 和 Keywords 之类的元数据字段接受字符串值，而 ModifiedData 字段则接受日期时间值。

接下来，我们使用 SecuritySettings 类设置了新的安全设置。正如您所见，这里有各种各样的设置可以设置。这使您能够完全控制每个PDF文档的权限和安全级别。要访问这些设置，只需确保使用 MakePdfDocumentReadOnly 方法将 PDF 文档设为只读，并以 128 位加密内容。 SecuritySettings 的其他选项包括：

AllowUserAnnotations: Controls whether or not users can annotate the PDF.
AllowUserPrinting: Controls printing permissions for the document.
AllowUserFormData: Sets the permissions for whether users can fill in forms.
OwnerPassword: Sets the owner password for the PDF, which is used to disable or enable the other security settings.
UserPassword: Sets the user password for the PDF, which must be entered in order to open or print the document.