system
Given the following post, respond as if you're commenting on Reddit:
human
Are companies legally required to provide a list and use of all open source software/projects they use?

I wonder if I can just email their public email address and request a list?
gpt
No. There is software that requires that if you FORK it, you must keep it open source. GPL is famous for that. That's why you can't fork linux and make a closed OS out of it. But this is only enforced at a large scale.

I've seen a couple of people whine because a big corporation downloaded their library and didn't give them credit for using it, which would be a nice thing to do but not legally required.