The law can't be put in a paragraph. You have 100 years in which to apply for registration. You can do it yourself if you know how. Even if you do it yourself you still have to know what and why. The copyright law covers what is created from the moment of creation.
Registration give the right to sue.
You have 100 years in which to apply for registration. Do not disclose any details of any copyright or any facts relating to your circumstances. See a lawyer. Before you post a message you must agree to the Terms of Use .