alt Hacker NewsNo, it’s source available but not open source. Open source requires at minimum the license to distribute modified copies. Popular open source licenses such as MIT [1] take this further:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
This makes the license transitive so that derived works are also MIT licensed.
[1] https://en.wikipedia.org/wiki/MIT_License?wprov=sfti1#Licens...
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MIT is not copyleft. The copyright notice must be included for those incorporated elements, but other downstream code it remains part of can be licensed however it wants.
AGPL and GPL are, on the other hand, as you describe.
No, the original definition of open-source is source code that is visible (open) to the public.
Not quite. You need to include the MIT license text when distributing the software*, but the software you build doesn't need to also be MIT.
*: which unfortunately most users of MIT libraries do not follow as I often have an extremely difficult time finding the OSS licenses in their software distributions