Jupyter notebook not trusted

I am using Anaconda to work on a Jupyter notebook which displays "Not Trusted" (see on screenshot below).

enter image description here

What does it mean? Is it a problem? How can I solve it?

It is a security feature to disable the execution of arbitrary code from untrusted notebooks, without the user's consent. There is a doc page on that http://jupyter-notebook.readthedocs.io/en/latest/security.html

It won't prevent you from manually running the code, that's actually one way of "trusting" the outputs.

From: stackoverflow.com/q/44943646