Forum OpenACS Q&A: Re: A few general questions
Well no. Fortunately the ACS was always open source from very early on; at least by 1998, possibly as early as 1995. That's how OpenACS was able to be created; first as a fork of ACS to use PostgreSQL, and then with support for both databases starting with version 4.x. The OpenACS project had been active for a good while (years?) before aD went out of business.