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Stanford SealFound via BoingBoing:

Stanford University has opened an on-line copyright renewal search database, covering the period from 1923 to 1963 when preventing a work from passing into the public domain required renewing its copyright registration. Prior to this database, there had been no easy or inexpensive way to search renewals for this period.

This database will assist both prospective publishers of orphaned works and public domain scanning groups such as Project Gutenberg.

 
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