There's no such thing as automatic assignment of copyright to a published. However, there are many bad contracts that come with this nonsense. You (as a presum

There's no such thing as automatic assignment of copyright to a published. However, there are many bad contracts that come with this nonsense. You (as a presumed grad student) are the value in the system. If you give the journals your output don't be surprised that they build walls to protect it - they're useless without you and they know it. They'll allow whatever they have to, and nothing else.