Lily, a work is protected by copyright the moment it is fixed in tangible form. The copyright notice provides additional protection, and in some countries (including US and Canada) you can't file your lawsuit unless you have also registered your copyright with the Copyright Office. Registering your work before infringement began may also allow the recovery of additional damages and costs.
In the UK (for example) there is no official registry of copyright, although there are some companies which you can register with (for a fee) and who will then act as an impartial independent witness - for example:
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