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Copyrights do expire.  Works eventually enter the public domain and may be freely used.  Current laws extend copyright protection for the life of the author plus 70 years.  Laws have changed over the years, so you would need to find what law was in effect when a work was created to determine if that work is still protected.

Below is an item that is now in the public domain:

OMIS is a tutorial designed to help you with your research process so that you can:

1. Determine the extent of information needed.
2. Access the needed information.
3. Evaluate information and its sources critically.
4. Use information effectively to accomplish a specific purpose.
5. Access and use information ethically and legally.

Examples of the types of item Zotero can cite in Chicago Style and what data to enter into each field.

You cannot directly copy-and-paste existing bibliographies into Zotero. You have several options for getting items from your pre-Zotero bibliographies into your Zotero for future use:

Includes APA, Chicago, and MLA. Look through the top tab to find your style, then select the item you want to cite at the left.