USA copyright catalog: Source for definitive release date and publisher metadata for software published in the USA

The copyright catalog from the Library of Congress has metadata about all copyrighted software released in the United States.

Here is an example record:

When searching for records you can set a “search limit” and specify “computer files” as the item type which can help dramatically in limiting the result set.

The data is particularly useful for identifying families of software as each record includes information specifying the previous registration of that title.

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