In that case, all it takes is the cooperation of the authors to publish their content elsewhere. The question is whether the professors are only okay providing

In that case, all it takes is the cooperation of the authors to publish their content elsewhere. The question is whether the professors are only okay providing it to you, or if they're okay with it being made openly available. If they retain the rights, it should be fine for it to be published in parallel elsewhere. I was a bit careful about stating that its all on the authors, as it is entirely legal for the author to give up their rights to a work (and I wouldn't have been surprised if the journals did that to avoid risk of lost revenue), in which case the hands of the authors' would be bound.