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可以分別設定使用者密碼及擁有者密碼 
Security Options有勾選代表允許這個功能 
設定完成後選[Encrypt As] 
Encryption Level說明 
40-bit RC4: Acrobat 3.0 and Later 
128-bit RC4: Acrobat 5.0 and Later 
Security Options說明: 
Printing:  Allow to print 
Modify Contents:  Allow to modify 
Copy:  Allow to copy or extract 
Modify Annotations: Allow to add or modify annotations or form fields 
Fill In:  Allow to input form field and signature (128-bit RC4 only) 
Screen Readers:  Allow to enable accessibility (128-bit RC4 only) 
Assembly:  Allow to modify document assembly (128-bit RC4 only) 
Degraded Printing:  Allow to print degraded mode (128-bit RC4 only) 
Extract data from pdf file - extract form data from PDF in C#.net, ASP.NET, MVC, Ajax, WPF
Help to Read and Extract Field Data from PDF with a Convenient C# Solution
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Extract data from pdf file - VB.NET PDF Form Data Read library: extract form data from PDF in vb.net, ASP.NET, MVC, Ajax, WPF
Convenient VB.NET Solution to Read and Extract Field Data from PDF
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將檔案另存新檔 
開啟檔案時會出現輸入密碼的保護機制 
C# PDF Text Extract Library: extract text content from PDF file in
Able to extract and get all and partial text content from PDF file. How to C#: Extract Text Content from PDF File. Add necessary references:
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VB.NET PDF Text Extract Library: extract text content from PDF
Extract and get partial and all text content from PDF file. Extract highlighted text out of PDF document. Extract Text Content from PDF File in VB.NET.
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由於之前設定並沒有勾選Copy 和Modify Annotations功能,因此當檔案開啟後
PDF-XChange Viewer的這兩個功能會無法使用。 
VB.NET PDF File Compress Library: Compress reduce PDF size in vb.
External cross references. Private data of other applications. Flatten visible layers. VB.NET Demo Code to Optimize An Exist PDF File in Visual C#.NET Project.
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VB.NET PDF File Merge Library: Merge, append PDF files in vb.net
Microsoft Office Word, Excel and PowerPoint data to PDF form. Merge PDF with byte array, fields. Merge PDF without size limitation. Append one PDF file to the end
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五、[Add Header and Footer]加入頁首及頁尾 
選擇要設定的檔案 
C# PDF File Merge Library: Merge, append PDF files in C#.net, ASP.
Merge Microsoft Office Word, Excel and PowerPoint data to PDF form. Append one PDF file to the end of another and save to a single PDF file.
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C# PDF File Compress Library: Compress reduce PDF size in C#.net
All object data. File attachment. External cross references. Private data of other applications. Flatten visible layers. C#.NET DLLs: Compress PDF Document.
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可以自訂頁首及頁尾文字以及字體顏色等 
設定完成後選[Save As] 
VB.NET PDF Image Extract Library: Select, copy, paste PDF images
By using RsterEdge XDoc PDF SDK for .NET, VB.NET users are able to extract image from PDF page or file and specified region on PDF page, then get image
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C# PDF Image Extract Library: Select, copy, paste PDF images in C#
Page, a Region on a Page, and PDF Document. C#.NET extract image from multiple page adobe PDF file library for Visual Studio .NET.
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將檔案另存新檔 
開啟檔案後可以看到在頁首及頁尾出現之前的設定樣式 
六、[Add Watermark by Text]加入浮水印文字 
選擇要設定的檔案 
設定出現文字,記得Order要選Foreground不然會看不到。 
設定完成後選[Save As]將檔案另存新檔 
開啟檔案後可以看到浮水印文的樣式 
七、[Add Watermark by Image]加入浮水印圖片 
選擇要設定的檔案 
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