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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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It's not possible. But if the author "goes away" for some time or let issues/suggestions opened long enough on the kata, "power users" can have access to it and maintain/correct it. Or any contributor to the kata, actually. But the author always stays the author of the kata.