> For example, how it affects previous versions? It does not affect older veraions - unless the previous license has a provision for this (and I doubt many peo

> For example, how it affects previous versions? It does not affect older veraions - unless the previous license has a provision for this (and I doubt many people would be willing to use software with such a license). > Can the copyright owner switch licenses at anytime? Yes, but many open source projects are made up of many copyright holders due to external contributors.