密码、安全性和元数据

VBC#

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 IronPdf

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

' Get file metadata
Dim 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 = 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")

PM > Install-Package IronPdf

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。这是通过使用像MetaData这样的类来实现的。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工作是通过实现MetaData类来访问各种PDF元数据选项，并使用您自定义的值设置它们。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<string> 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。一旦PDF加载完成，我们就用pdf.MetaData.Keys来获取PDF的当前元数据。要移除现有的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.Keywords），然后只需为其分配新的值。像ModifiedData字段采用日期时间值。

接下来，我们使用SecuritySettings类设置新的安全设置。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，您只需确保使用MakePdfDocumentReadOnly方法将PDF文档设置为只读，以128位加密内容。其他的SecuritySettings选项包括：