公有领域是指任何个人或团体都不具有其所有权的知识财产。版权到期的作品，或者创作者公开放弃所有权的作品自动进入公有领域。
Works are part of the public domain when their copyright expires or when the artist designates the work as such.
按照原定计划，该套书在2015年底巴伐利亚州的70年版权到期后被推出。 在其三年的筹备期内，它引发了诸多争议。
The project had been planned to follow the expiration at the end of 2015 of a 70-year copyright held by the state of Bavaria and stirred controversy during the three years it took to complete.
合同到期时，无需书面通知，合同提到的所有权利自动返还版权方。
On expiration of this license, all rights herein granted revert to the Proprietors without further written notice.
版权是有时间限制的，会到期。
版权是有时间限制的，会到期。
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