optional owner password check

Author: d-peczkowski

src/foundation/src/PDFsharp/src/PdfSharp/Pdf.IO/PdfReader.cs

@@ -288,6 +288,7 @@ PdfDocument OpenFromStream(Stream stream, string? password, PdfDocumentOpenMode
                 _document.Options.EnableOwnBinaryHeader = _options.EnableOwnBinaryHeader;
                 _document.Options.EnableLineBreakInArrayObjects = _options.EnableLineBreakInArrayObjects;
                 _document.Options.DisablePagesAndCatalogAtEnd = _options.DisablePagesAndCatalogAtEnd;
+                _document.Options.EnableSecurityChecks = _options.EnableSecurityChecks;
 
                 _document._state |= DocumentState.Imported;
                 _document._openMode = openMode;
@@ -380,7 +381,11 @@ PdfDocument OpenFromStream(Stream stream, string? password, PdfDocumentOpenMode
                             goto TryAgain;
                         }
                         else
-                            throw new PdfReaderException(PsMsgs.OwnerPasswordRequired);
+                        {
+                            if(_document.Options.EnableSecurityChecks)
+                                throw new PdfReaderException(PsMsgs.OwnerPasswordRequired);
+                            _document.SecuritySettings.HasOwnerPermissions = true;
+                        }
                     }
                     // ReSharper restore RedundantIfElseBlock
                 }

src/foundation/src/PDFsharp/src/PdfSharp/Pdf.IO/PdfReaderOptions.cs

@@ -141,6 +141,8 @@ public class PdfReaderOptions
 
         public bool DisablePagesAndCatalogAtEnd { get; set; } = true;
 
+        public bool EnableSecurityChecks { get; set; } = true;
+
         // Testing only
 
         //public bool UseOldCode { get; set; } = false;

src/foundation/src/PDFsharp/src/PdfSharp/Pdf/PdfDocumentOptions.cs

@@ -126,6 +126,8 @@ public PdfUseFlateDecoderForJpegImages UseFlateDecoderForJpegImages
 
         public bool DisablePagesAndCatalogAtEnd { get; set; } = true;
 
+        public bool EnableSecurityChecks { get; set; } = true;
+
         public string LineEnding => EnableLfLineEndings ? "\n" : "\r\n";
 
         public byte[] LineEndingBytes => Encoding.ASCII.GetBytes(LineEnding);