Obviously it won't help where companies want to retain their copyright longterm but I want to set a better example. I'm thinking of coming up with a license th

Obviously it won't help where companies want to retain their copyright longterm but I want to set a better example. I'm thinking of coming up with a license that offers no additional rights for a limited duration and then allows free use to emulate what would happen if copyright durations were more sensible. I don't think it will meet the OSS definition of Open Source although I think it should be possible to make it compatible with liberal licenses by offering mechanisms to exclude code (snippets, files or folders) from the licence. If you wanted you could dual license with a real OSS license. I'll put it on Github do a "Show HN" when I have something worth looking at. Does anyone know of any examples of this being done? Also I've never been able to work out whether code on Github needs to be under a license that allows modification/distribution, it seems like as long as it can be read it can still be copyright protected, does anybody know?