Software is a potentially excludable public good. It is possible, at some cost, to exclude non-paying users from its consumption by using copyright law or technological restraints. Licensing the software under proprietary license terms makes of it a private good, licensing it under the BSD does...

The TeX typesetting software was developed by Donald E. Knuth in the late 1970s. It was released with an open source license and has become a reference in scientific publishing. TeX is now used to typeset and publish much of the world’s scientific literature in physics and mathematics. This...