Comment by woodrowbarlow
5 days ago
the FSF/OSI are big on emphasizing that "free/open" means more than exposing the designs and mechanisms; it means guaranteeing certain freedoms and rights to the users of your software.
what you're describing is usually called "source-available".
If open source doesn't specify a license that is it under then you should only assume that the source has been made available. Both GPL and Apache licensing are considered open source, even though apache is more permissive for commercial derivatives. No one calls GPL "source-available" in common conversation regardless of OSI's opinion.
As well as some variants of BSD licenses: https://en.wikipedia.org/wiki/BSD_licenses
>Two variants of the license, the New BSD License/Modified BSD License (3-clause), and the Simplified BSD License/FreeBSD License (2-clause) have been verified as GPL-compatible free software licenses by the Free Software Foundation, and have been vetted as open source licenses by the Open Source Initiative. The original, 4-clause BSD license has not been accepted as an open source license and, although the original is considered to be a free software license by the FSF, the FSF does not consider it to be compatible with the GPL due to the advertising clause.