A jammed laser printer sparked the modern open-source movement

The communal culture of the early AI Lab

In the 1970s, the Artificial Intelligence Laboratory at the Massachusetts Institute of Technology operated under a computing culture that treated software as a shared resource. Programmers, who referred to themselves as hackers, worked primarily on the Incompatible Timesharing System, an operating system developed directly within the laboratory. Under this arrangement, source code was openly accessible across the local network. Anyone who noticed a defect, an inefficiency, or a missing feature was expected to fix it or adapt the software to meet the community's immediate needs.

This open environment was not formalized through legal frameworks; it was simply the default practice of an academic and research collective. When researchers acquired new hardware, they routinely rewrote or extended the vendor's software to integrate it with their local systems. Modifying code was viewed as an ordinary part of operating a computer, much like tuning an engine or repairing a piece of laboratory equipment. Software secrecy was virtually nonexistent within the lab, and withholding useful improvements from colleagues was considered a breach of basic professional etiquette.

The silent laser printer and the non-disclosure agreement

That collaborative dynamic faced a direct challenge when the laboratory received an advanced laser printer from the Xerox Corporation. The machine was technically superior to the lab's older equipment, capable of fast, high-resolution printing, but it suffered from frequent paper jams. In an office where dozens of researchers submitted print jobs from across the building, a mechanical stoppage could silently halt productivity. Jobs piled up in the queue, and staff members walked down long corridors only to find their work trapped behind an unattended jam.