Those newspapers did not sign a legally binding SF312 CLASSIFIED INFORMATION NONDISCLOSURE AGREEMENT of which every single person who holds a clearance must sign.

The very first sentence is:

Intending to be legally bound, I hereby accept the obligations contained in this Agreement in consideration of my being granted access to classified information.

Other parts being

I hereby agree that I will never divulge classified information to anyone unless: (a) I have officially verified that the recipient has been properly authorized by the United States Government to receive it; or (b) I have been given prior written notice of authorization from the United States Government Department or Agency (hereinafter Department or Agency) responsible for the classification of information or last granting me a security clearance that such disclosure is permitted. I understand that if I am uncertain about the classification status of information, I am required to confirm from an authorized official that the information is unclassified before I may disclose it, except to a person as provided in (a) or (b), above. I further understand that I am obligated to comply with laws and regulations that prohibit the unauthorized disclosure of classified information

In addition, I have been advised that any unauthorized disclosure of classified information by me may constitute a violation, or violations, of United States criminal laws, including the provisions of sections 641, 793, 794, 798, *952 and 1924, title 18, United States Code; *the provisions of section 783(b}, title 50, United States Code; and the provisions of the Intelligence Identities Protection Act of 1982. I recognize that nothing in this Agreement constitutes a waiver by the United States of the right to prosecute me for any statutory violation.

Unless and until I am released in writing by an authorized representative of the United States Government, I understand that all conditions and obligations imposed upon me by this Agreement apply during the time I am granted access to classified information, and at all times thereafter.

This contract is binding FOR LIFE unless waived by an official.

https://www.gsa.gov/reference/forms/classified-information-nondisclosure-agreement-1