> Only 25 percent of all works were ever renewed,
which placed
> the vast majority of material in the public domain a
> few decades after it was published.
Actually, a 1960 Copyright Office survey found that only about 15% of all works were ever renewed. The exact number varied according to the type of work. For example, only 7% of all written works were renewed, while 74% of moviews were renewed.
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