Good question: https://en.wikipedia.org/wiki/Intergalactic_Computer_Network was coined in 1963 and is what started ARPA on the internet. The cool thing about the attitude they had, which continues today, is the “free sharing” of data and technology.
It started off as a memo that became a huge project. It involved ARPA, Universities, businesses and private individuals. Still does in 2016.
“MEMORANDUM FOR: Members and Affiliates of the Intergalactic Computer Network
FROM: J. C. R. Licklider
SUBJECT: Topics for Discussion at the Forthcoming Meeting
First, I apologize humbly for having to postpone the meeting scheduled for 3 May 1963 in Palo Alto. The ARPA Command & Control Research office has just been assigned a new task that must be activated immediately, and I must devote the whole of the coming week to it. The priority is externally enforced. I am extremely sorry to inconvenience those of you who have made plans for May 3rd. Inasmuch as I shall be in Cambridge the rest of this week, I am asking my colleagues here to re-schedule the meeting, with May 10th, Palo Alto, as target time and place.”
So right in the fundamental structure of the intergalactic computer network, or “internet” for short, is openness and sharing.
One of the reasons *why* security is so difficult on the internet is because it was built to be open.