Do I have to give my copyright to a publisher?
Academic publishers have traditionally required that authors transfer (or "assign") their copyright to the publishers. However, it is becoming more common for publishers to accept "non-exclusive licenses" to publish your work. In that case, you would retain the copyright and be able to make subsequent uses of your own work without permission.
Even when you do transfer your copyright to a publisher, it is possible to retain rights to make certain uses of your work. It is important to read publication agreements carefully and to be ready to negotiate with publishers when necessary.