I’m new author here. I submitted my first item a few weeks ago and it was rejected. I was told that I cannot resubmit that item.
Do I have to provide a prove for anything used on the item that I can use it on the marketplace? If yes, how.
For example, I’m using a jquery plugin from open source which has MIT license. Do I have to provide anything with it to indicate it’s license?
No, you don’t need to provide proof for such free libraries, but it is a good practice to include links to libraries you use in readme file. This is not the reason for item rejection, reviewer should have provided details on why it was rejected (this doesn’t have to be very helpful, but you can’t raise any protest against it).