Switch license based on specific criteria

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Some users may not want to switch the license of all their sentences, or at least not all at once.

I think the main criteria would be by language. It's more likely that the user wants to switch the license of the sentences in their native language first. For sentences in other languages, there's a higher chance they copy-pasted them from somewhere else and therefore feel more unsure about the legal aspect.

Another criteria would be by date. In my case, many of the sentences I contributed are from a time when I didn't know much about licenses. When we started to share the corpus, I never took the time to review and remove sentences that I own and consider to be non CC-BY. I can imagine that other people go through the same stages: they first just contribute whatever sentence they find interesting, not just sentences they thought of themselves, but sentences they heard or read somewhere else. Then later on they learn more about intellectual property, licenses and all that stuff, and are more careful about what they contribute. So if they were to switch the license of their sentences, they wouldn't feel safe doing it for their older sentences.