Stripping tags

I have exactly the same question. Although I could write a handler for the paste event, I assume that ckEditor has a way of dealing with allowed/forbidden tags already. To me, it does not make sense that buttons in the menu can be disabled, but the corresponding tags are still allowed when pasting. The behaviour when pasting tags that are not allowed should be configurable: either remove the elements that are not allowed, or pass them through a custom filter, or fail to paste with a warning or error message.

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I cannot find documentation about this in the code. Does anybody know how to implement this feature? Thanks, Jens