The reason is that it’s based in copyright law but uses it for the community instead of the individual. Without copyright, copyleft has no power.
I have many problems with copyright as it’s currently implemented, but with copyleft it usefully creates a social contract: if you want to be involved for the benefits, you must also uphold the rule of contributing back.
It’s called “copyleft” for a reason.
The reason is that it’s based in copyright law but uses it for the community instead of the individual. Without copyright, copyleft has no power.
I have many problems with copyright as it’s currently implemented, but with copyleft it usefully creates a social contract: if you want to be involved for the benefits, you must also uphold the rule of contributing back.