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Spire.PDF for .NET is a professional .NET PDF component which enables you to generate, read, edit and manipulate PDF documents in C#, VB.NET. It can be generally applied in server-side (ASP.NET or any other environment) or with Windows Forms applications without installing Adobe Acrobat or any other external libraries.
Many features are supported in Spire.PDF for .NET. First let us have a first glance of this .NET PDF component, then, expound its detail features one by one.
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From above picture, you can easily find that the first step is to decrypt PDF file by owner password. So the original owner password is necessary. You can decrypt it by this method: Spire.Pdf.PdfDocument(string filename, string password)
Then, modify passwords by resetting owner password and user password. PDFSecurity class which is in the namespace Spire.PDFDocument.Security can help you not only to set owner password and user password, but also can set user permissions to restrict user access.
