Why did they require that for creative property there must be a public domain?

In general, books published before 1923 in the United States are considered in the public domain.

一般来说, 1923年以前在美国出版的图书被认为是在公共域.

Works can also fall into the public domain if their copyright has expired.

如果作品的版权已经过期,也会落入公共域.

Despite this, pigs still have a poor image in the public domain.

但是, 猪现在在公共的场所还是占很低的地位.

Shareware differs from public domain software, which is not copyrighted.

共享软件不同于公共域软件, 后者是没有版权的.

If he did not, the work passed into the public domain.

如果他放弃, 该作品则流入公共领域.

Nonproprietary products are in the public domain and anyone can produce or distribute them.

非专有产品处于共有领域,任何人都可以生产或分销它们.

The theory of public domain is an important theory in copyright law.

摘要公共领域理论是著作权法中的一个重要理论.

Nevertheless, in the public domain,'zero distance'is actually harmful.

然而, 在公共领域里, “ 零距离 ” 是有害的.

Some creators give up their copyright and donate their work to the public domain.

一些创作者放弃版权并将作品捐赠给公共域.

We encourage users to contribute their creations to the public domain or consider progressive licensing terms.

我们鼓励用户向公共领域贡献自己的创作或考虑进一步的许可条款.

The old documents have now become public domain.

那些老文件现在已成为公有财产.

All the source code in this book is hereby released to the public domain.

不管你是否喜欢,你能没有任何约束的使用它们.

CBQ is a public domain networking technique that can accommodate all netwok speeds.

CBQ是一种公用域联网技术,它能适应所有的网络速度.

She chose a career in public education.

她选择公共教育作为自己的职业.

The researchers say these changes raise questions about the sefic civic duty public education.

研究者认为这些变化导致公立教育中关于公民责任方面的问题越来越多.

Certainly private college development depends on demonstration effect of public education are marching side by side.

当然民办学校的发展离不开公办教育的示范作用,公办、民办教育形成齐头并进的局面.

The issue could be settled by requiring public education for everyone.

这个问题可通过强制所有人接受公共教育加以解决.

The Fire Protection Command places great emphasis on public education on fire prevention.

该处的防火总区大力推行教导市民防火的工作.

The researchers say these changes raise questions about the civic duty of public education.

研究人员指出这些变化引起了对公民公共教育责任的问题.

Each state has laws governing education and state revenues, in part , finance public education.

每州制法管理教育,由税务来负担公立教育.