As the author of your ETD you own the copyright and you make decisions about sharing or relinquishing some or all of these rights.
As of March 1, 1989, the copyright warning does not have to appear for a work to be legally copyrighted. However, it is a good idea to remind people of your copyrights by including:
© 2017 by [your name]
Consider adding statements that grant permission or limit use. See Permissions column on the far right.
Why registering your copyright? To possibly receive greater compensation with less documentation when filing an infringement suit.
Permission to use a copyrighted work is NOT required if:
2. Nature of the copyrighted work
3. Amount, substantiality
Search Sherpa RoMEO for publishers copyright policies