IBM had SHARE and GUIDE, for scientific and commercial users. SHARE was formed in 1955. Every large computer maker had a user's group, with differing restrictions on program redistribution. Many of the groups were run by the computer companies themselves, and had restrictions on who could join. Individual programs were published in a catalog with a modest charge to cover copying costs (though it would add up very quickly if you wanted ALL the programs). Groups like ACM maintained a collection of algorithms. For a few years in the 70's, ACM actually published a book of all available non-commercial software. I can't think of any organization that was a large-scale clearinghouse/repository for different vendor's unencumbered software until archives began to spring up in the late 70's. The result of this is very little early software has survived, because as computer companies disappeared, no one saved the bits. As someone else has mentioned, the actual distribution restrictions varied. The use of copyright as a mechanism to force source code to remain available is a relatively modern invention (early 80's) by FSF/RMS. Before that, it either was placed in the Public Domain, or was copyrighted with varying restrictions. The rules for copyright have changed over the past 50 years, so there are programs which have gone into the Public Domain even though they were published with a copyright notice. "Closed" sources are generally considered proprietary, unpublished works. The earliest versions of UNIX, for example, carry no copyrights or other notices, but were considered proprietary, unpublished works.