Batch add Custom-Fields into PDF files

Dear Sirs,

I need to do the following on large amount of PDF documents. Please, find an example of what I am trying to do:

1. I have a folder that contains 50k+ PDF documents.
2. Each of those files contains already some metadata fields (custom properties?).
3. I would like to add in some automated way additional 10-15 metadata fields (created and named by me) to each of those files.
4. After adding new metadata fields I would like to update them also in an automated way with information stored in xlsx/txt/csv file.

image

Can I do that using any of your applications?

If you need more details about my issue please do not hesitate to ask.
I really care about getting as accurate answer as I can as your application would be potentially used in a large project.

It will run on Windows 7 Pro (32&64 bit versions).

We would like to use eventually this part of PDF document called "Custom Properties".
Is it a part of PDF's metadata?

I am sorry if my questions are imprecise but I am very new to this topic.

Thank you very much in advance for any information provided.

Best Regards,
Customer
--------------------------------------------
VeryPDF Advanced PDF Tools Command Line product has this function, please download VeryPDF Advanced PDF Tools Command Line from following web page to try,

http://www.verypdf.com/app/advanced-pdf-tools/advanced-pdf-tools-command-line-guide.html
http://www.verypdf.com/app/advanced-pdf-tools/try-and-buy.html#buy-cmd

http://www.verypdf.com/pdfinfoeditor/pdf-tools-command-line.htm

You can use following command line and options to add custom-fields into PDF files easily,

Add new information to PDF file
-y
There are several ways to add new information like follows:
Add new custom Properties to an existing PDF file and overwrite original custom Properties,
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "key1=value1,key2=value2"
or
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "/key1(value1) /key2(value2)"
Append new custom Properties to an existing PDF file,
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "+key1=value1,key2=value2"
or
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "+/key1(value1) /key2(value2)"
e.g.
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "Our Company=VeryPDF Company, Support Email=support@verypdf.com, Our Web URL=http://www.verypdf.com"
or
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "/Our#20Company(VeryPDF Company) /Support#20Email(support@verypdf.com) /Our#20Web#20URL(http://www.verypdf.com)"
or
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "+/Our#20Company(VeryPDF Company) /Support#20Email(support@verypdf.com) /Our#20Web#20URL(http://www.verypdf.com)"

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