How to split and merge PDF files which protected by 128bit AES Encryption security settings? Advanced Encryption Standard (AES)

I was try to merge using pdfpg.exe on command-line.
But it was return this message 'java.io.IOException: trailer not found.'

what is mean?
Customer
------------------------------------
I tried to this command,

pdfpg.exe c:\file.pdf 1,2,3,4,5,6,7..... c:\file2.pdf

"C:\Program Files (x86)\VeryPDF PDF Split-Merge v3.0\pdfpg.exe" D:\downloads\128AES-file.pdf,1 D:\downloads\out.pdf
Merge PDFs and restructure bookmarks, AcroForms ...
java.io.IOException: trailer not found.
   at 0x0058e0be (Unknown Source)
   at 0x0058e602 (Unknown Source)
   at 0x00558ad4 (Unknown Source)
   at 0x0055a504 (Unknown Source)
   at 0x00410d81 (Unknown Source)
   at 0x0040f552 (Unknown Source)
   at 0x00419822 (Unknown Source)
   at 0x0041985a (Unknown Source)
   at 0x0040840b (Unknown Source)
   at 0x0040bf61 (Unknown Source)
   at 0x005db00e (Unknown Source)
   at 0x005928b0 (Unknown Source)
   at 0x00558907 (Unknown Source)
   at 0x005589e7 (Unknown Source)
   at 0x004012d9 (Unknown Source)
   at 0x0040117e (Unknown Source)
   at 0x00401014 (Unknown Source)
   at 0x773a3366 (Unknown Source)
   at 0x77d39f6e (Unknown Source)
   at 0x77d39f41 (Unknown Source)

  
Customer
------------------------------------

image

We have checked your PDF file, your PDF file was protected by 128bit AES encryption, we suggest you may use "PDF Password Remover" to remove security settings from this PDF file first,

http://www.verypdf.com/app/pdf-password-remover/try-and-buy.html

after you removed the security settings from this PDF file, you can use pdfpg.exe to extract pages from this PDF file without any problem.

AES: Advanced Encryption Standard (AES)

VeryPDF

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