There is a difference between "strong" copyleft and "weak" copyleft. An example of "weak" (non-viral) copyleft is the CDDL. In fact, the CDDL's Wikipedia page talks about strong and weak copyleft.
You can read [1] for a breakdown of copyleft by an actual lawyer. Suffice it to say that Wikipedia's Copyleft page is woefully inadequate.
There is a difference between "strong" copyleft and "weak" copyleft. An example of "weak" (non-viral) copyleft is the CDDL. In fact, the CDDL's Wikipedia page talks about strong and weak copyleft.
You can read [1] for a breakdown of copyleft by an actual lawyer. Suffice it to say that Wikipedia's Copyleft page is woefully inadequate.
[1]: https://writing.kemitchell.com/2018/10/24/How-to-Speak-Copyl...