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Aspose.Pdf for .NET offers the feature to Digitally Sign the PDF documents and you can also use our API to determine if the Signatures inside PDF are valid or not. For further details, please visit
- Set Privileges on an Existing PDF File
- Encrypt PDF File using Different Encryption Types and Algorithms
- Decrypt PDF File using Owner Password
- Change Password of a PDF File
- How to - determine if the source PDF is password protected
- Get information about PDF document security
- Determine correct password from Array
- Extract Signature Information
Should you have any further query, please feel free to contact.