How to deal with the copyright issue?

Hi,
Thanks for your great dataset which definitely speeds up scientific research!
As a fan and user of your dataset, I was really curious how do you guys deal with copyright issues?
1. Do you have the right to distribute the submitted articles?
2. As a user of the dataset, may I have the redistribution right? For example, if I do another process step designed for some research tasks based on your dataset, could I distribute it to other people?
Thanks!