Charltsing.Liu

[yb.zip](https://github.com/user-attachments/files/17257049/yb.zip)  i try code  ``` using (PdfDocument pdf = PdfDocument.Open(fullname)) { PdfDocumentBuilder builder = new PdfDocumentBuilder { }; PdfDocumentBuilder.AddedFont font = builder.AddStandard14Font(Standard14Font.Helvetica); PdfPageBuilder pageBuilder = builder.AddPage(pdf, 1); pageBuilder.SetStrokeColor(0,...

[CID-PDFA.zip](https://github.com/user-attachments/files/17233317/CID-PDFA.zip) i try [this](https://github.com/UglyToad/PdfPig/wiki/Document-Layout-Analysis), but it outputs incorrect results 

update Letter.cs to support unicode Code

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Is it possible to add the original string or the original bytes in Letter so that I can find the original instruction position of this character in Contents of PDF....

How to get MediaBox/CropBox/TrimBox/BleedBox/ArtBox i do not found these in MuPDFPage

[tif.zip](https://github.com/user-attachments/files/17893745/tif.zip) Most CCITTFaxDecode can work, except for this PDF

`i have some Tj operators read from my PDF, like (\000\003) Tj or [] TJ` i can get the actual unicode text by itextsharp , But I don't know how...

Image Control provide zoom in and out of images using scroll wheel

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When mouse hovering over the Image control, scroll the mouse wheel to zoom in and out of the image

不支持的加密方式

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 [nt.zip](https://github.com/user-attachments/files/19724899/nt.zip)

[default.zip](https://github.com/user-attachments/files/20272865/default.zip) 这个pdf打开会报错。有两个xref Acrobat Reader 不报错

这个问题是5.5.14.0这个伪版本的iTextSharp\core\iTextSharp\text\pdf\PdfStamperImp.cs 代码中的bug。 ``` if (reader.IsEncrypted() && append) { crypto = new PdfEncryption(reader.Decrypt); } ``` 这句代码只在追加的时候才会读取加密参数，所以在补丁丁里面直接保存pdf，就会丢失权限。 [unethicalreading.zip](https://github.com/user-attachments/files/19821728/unethicalreading.zip) 这是测试文件 在官方版本的5.5.13.4中，改成了 if (reader.IsEncrypted() && (append || PdfReader.unethicalreading)) 这样也有bug，会造成保存pdf时，永远都会有加密。无法实现修改权限并删除加密提示的功能。 我反编译看了一个多小时代码，才发现这个问题。所以我增加了一个PdfReader.unethicalwriting参数 ``` if (reader.IsEncrypted() &&...