My books are mostly classics, no copyright problems, but inevitably some modern works.
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no copyright problems
没有版权问题
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In the information era, new problems emerging in the intellectual property field can no longer be solved by the traditional copyright systems and related laws.
信息时代知识产权领域出现的新问题，使得原有的版权制度与法律条文显得力不从心。
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