下載并引用PdfSharp.dll

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using PdfSharp.Pdf;

using System.IO;

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public string PDFSecurity(string strSourcePDFFile, string strDestPDFFile, bool AddUserPassword, string strPassword){try{PdfSharp.Pdf.PdfDocument pdfsourcedoc = PdfSharp.Pdf.IO.PdfReader.Open(strSourcePDFFile, PdfSharp.Pdf.IO.PdfDocumentOpenMode.Modify);pdfsourcedoc.SecuritySettings.DocumentSecurityLevel = PdfSharp.Pdf.Security.PdfDocumentSecurityLevel.Encrypted128Bit;pdfsourcedoc.SecuritySettings.OwnerPassword = "adamtest";pdfsourcedoc.SecuritySettings.PermitAccessibilityExtractContent = false;pdfsourcedoc.SecuritySettings.PermitAnnotations = false;pdfsourcedoc.SecuritySettings.PermitAssembleDocument = false;pdfsourcedoc.SecuritySettings.PermitExtractContent = false;pdfsourcedoc.SecuritySettings.PermitFormsFill = false;pdfsourcedoc.SecuritySettings.PermitFullQualityPrint = false;pdfsourcedoc.SecuritySettings.PermitModifyDocument = false;pdfsourcedoc.SecuritySettings.PermitPrint = false;if (AddUserPassword == true){pdfsourcedoc.SecuritySettings.UserPassword = strPassword;}pdfsourcedoc.Save(strDestPDFFile);return "";}catch (Exception ex){return ex.ToString();}}

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總結

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