I have a jupyter notebook (say abc.ipynb) in one computer and i transferred the file to another computer and i am running the abc.ipynb notebook in the later computer. When i open the notebook in the top right, it is showing "Not Trusted" and if i am saving it (cntrl+s), in terminal i am getting as shown in the screenshot image (in green colour letter it says saved, but in brown colour letter it says not trusted). But if i have opened the notebook (def.ipynb) in the computer where it was originally created, in the top right it shows as "Trusted" and when i save the notebook in terminal it will be saved (with green colour code letters) as in screenshot image attached here..

So, why is the notebook when copied from other system and running it in the later system shows not trusted..??

Any suggestions.? Thank you.