We want to use 7Zip to extract the contents of the ISO file in our paid product. There is no other API free library available as of now that can unzip ISO files on all Windows platforms that we want to target. PowerShell trick does not work on Windows Server 2K8 R2. I have tries all the other options.
Here is the licensing info for 7Zip: https://www.7-zip.org/license.txt
It clearly says "Redistributions in binary form must reproduce related license information from this file." which seems to suggest that I can redistribute it and that is what PeaZip (another open source tool) seems to be doing as well.
My question is if I include the pre-built 7Zip.exe and 7Zip.dll binaries in my product's installer then does that mean that we must make our product open source as well?? Can it remain CLOSED source?
How does addition of these other two licensing restrictions (LGPL & BSD 3-clause License and unRAR liencesing restriction) affect our scenario? We will not be using the binaries for doing any 7Z or RAR compression decompression all we want is a way to extract contents of ISO file.