Can I do small changes after the copyright of a novel?
My changes includes grammatical error, sentence reformation and fixing logical errors?
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You can make minor changes to a copyright-registered work, such as fixing typographical errors.
If you do a heavy revision, such as adding new chapters or completely rewriting certain parts, copyright law considers this a derivative work, and you will have to register copyright for this revision to have the changes covered by copyright law.
To make this more clear: The problem with changes to your text is not that you lose copyright to your work by these changes. You don't. Everything that remains unchanged is still registered with the copyright office. The problem is that the changes aren't covered by the registration of the original, so if someone steals them you cannot prove you wrote them.
Also note, that this question and answer only apply to the United States. Registering copyright is unnecessary and impossible in any other legislation.