Add 83 securing-and-signing-pdf code examples

[agent-aspose-pdf-examples]

securing-and-signing-pdf

83 code example(s) for the securing-and-signing-pdf category.
Target: Aspose.PDF for .NET 26.4.0

Examples

#	Example	Difficulty
1	Encrypt PDF with Owner Password and High‑Resolution Printing	beginner
2	Decrypt Password-Protected PDF Using Owner Password	beginner
3	Set PDF Privileges to Disable Extraction and Form Filling	beginner
4	Add Visible Digital Signature to Second Page of PDF	intermediate
5	Add Invisible Digital Signature with Timestamp to PDF	intermediate
6	Enumerate PDF Signature Fields and Show Basic Info	beginner
7	Extract Signature Field Metadata from PDF	intermediate
8	Extract Images from Signed PDF to PNG	intermediate
9	Remove Digital Signature from PDF using Aspose.Pdf	beginner
10	Sign PDF with Smart Card Certificate	intermediate
11	Sign PDF with Smart Card Certificate without PIN Prompt	intermediate
12	Custom Security Handler Logging PDF Access	intermediate
13	Encrypt PDF with Custom Security Handler to Disable Copy‑Paste	intermediate
14	Sign PDF with Trusted Timestamp	intermediate
15	Validate PKCS#7 Detached Signature and Certificate Chain in a PDF	intermediate
16	Validate PDF Digital Signature Using OCSP	intermediate
17	Validate PDF Signature Using CRL Revocation Checking	intermediate
18	Extract Signing Time from PDF Signature and Convert to UTC	intermediate
19	Extract Certificate Chain from PDF Signature	intermediate
20	Sign PDF with Reason, Contact, and Location	intermediate
21	Sign PDF with Custom Image Appearance	intermediate
22	Certify PDF to Prevent Further Modifications	intermediate
23	Certify PDF with Form Filling Permission	intermediate
24	Certify PDF with Append-Only Signature to Allow Annotations	intermediate
25	Sign PDF with PKCS#1 Signature (no certification)	intermediate
26	Lock Form Fields After Digital Signature in PDF	intermediate
27	Digitally Sign PDF and Lock It for Read‑Only Access	intermediate
28	Encrypt PDF with AES‑256 and Set User/Owner Passwords	intermediate
29	Encrypt PDF with RC4 128‑bit and Restrict Editing	beginner
30	Decrypt PDF and Extract Embedded Images	intermediate
31	Decrypt PDF with Owner Password and Update Metadata	intermediate
32	Batch Encrypt PDFs with Passwords Derived from File Names	intermediate
33	Batch Decrypt Password-Protected PDFs Using a Lookup Table	intermediate
34	Batch Sign PDFs Using Author Metadata to Select Certificates	intermediate
35	Batch Sign PDFs with Unique Visible Signature Images	intermediate
36	Batch Encrypt and Sign PDFs	intermediate
37	Encrypt PDF with Print‑Only Permission	beginner
38	Encrypt PDF and Allow Copying While Blocking Printing	beginner
39	Encrypt PDF with Printing and Copying Permissions	beginner
40	Encrypt PDF and Restrict Content Extraction	beginner
41	Decrypt PDF, Extract Images, and Re‑encrypt with New Owner Password	intermediate
42	Download, Sign, and Upload PDF to Azure Blob Storage	intermediate
43	Encrypt PDF with User Password using Aspose.Pdf	beginner
44	Sign PDF with Windows Store Certificate using Aspose.Pdf	intermediate
45	Sign PDF Using a Hardware Token (PKCS#11)	intermediate
46	Validate PDF Signature and Report Errors	intermediate
47	Validate PDF Signature and Verify Timestamp Within Certificate Validit...	intermediate
48	Extract Signature Image from PDF and Save as PNG	intermediate
49	Extract Signature Images from PDF	intermediate
50	Extract Images from Each Page of a Signed PDF	intermediate
...	33 more examples

Key APIs Used

Aspose.Pdf.Annotations.Annotation, Aspose.Pdf.Annotations.AnnotationCollection.Delete, Aspose.Pdf.Annotations.TextAnnotation, Aspose.Pdf.CryptoAlgorithm, Aspose.Pdf.DigestHashAlgorithm, Aspose.Pdf.Document, Aspose.Pdf.Document(string, string), Aspose.Pdf.Document.ChangePasswords, Aspose.Pdf.Document.Decrypt, Aspose.Pdf.Document.Decrypt(), Aspose.Pdf.Document.EnableSignatureSanitization, Aspose.Pdf.Document.Encrypt, Aspose.Pdf.Document.Flatten, Aspose.Pdf.Document.Form.Add, Aspose.Pdf.Document.Form.SignaturesAppendOnly, Aspose.Pdf.Document.Info, Aspose.Pdf.Document.OptimizeResources, Aspose.Pdf.Document.Save, Aspose.Pdf.Document.Save(), Aspose.Pdf.Document.SetXmpMetadata, Aspose.Pdf.DocumentInfo, Aspose.Pdf.DocumentInfo.Title, Aspose.Pdf.Drawing.Rectangle, Aspose.Pdf.ExternalSignature, Aspose.Pdf.Facades.PdfFileSignature, Aspose.Pdf.Facades.PdfFileSignature.Certify, Aspose.Pdf.FileSpecification, Aspose.Pdf.Form, Aspose.Pdf.Form.Add, Aspose.Pdf.Form.SignaturesAppendOnly
(+61 more)

Tags

AES-256 Aspose.Pdf C# PDF PDF-security aes-256 aes256 annotation-removal annotations append-only aspnet aspose aspose pdf aspose-pdf aspose.pdf attachment audit azure-blob batch batch processing

Difficulty Distribution

• beginner: 16 example(s)
• intermediate: 67 example(s)

Pipeline Stages

• LLM Fix: 41
• Baseline (1st try): 31
• Regen with KB: 9
• Final LLM Recovery: 2

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