Cannot copy text in converted html same as original pdf file

Hi support team,
I using GroupDocs Conversions .NET for convert file to html.
I can not copy text in converted html same as original pdf file because text was converted to image.
This problem occurred with original pdf created by:

  • PDFLib
  • Adobe Acrobat Standard 2017 17 Paper Capture Plug-in.

Can you tell me the list of PDF producer, which have same limitation?
Sample source code is same with my other topic.

@huunamnguyen2713

Could you please share the problematic/source and resultant PDF files?

@atir.tahir
For information security reasons, these cannot be shared.
My question is the list of PDF producer, which have same limitation, if you have.

@huunamnguyen2713

We are not aware of such PDF tools/software. However, if you are using GroupDocs.Conversion to convert a PDF to HTML and the output doesn’t allow to copy text (text is converted to image in the resultant HTML), we may need a problematic file to reproduce and investigate the issue.