began acquiring copies of American films in 1909, but not all were kept. Due to improvements in film technology and recordkeeping, few films produced in the 1950s or beyond have been lost. Rarely, but occasionally, films classified as lost are found in an uncataloged or miscataloged archive or private collection, becoming "rediscovered films".

Conditions

During most of the 20th century, American copyright law required at least one copy

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