With the rise of knowledge-based economy in Mid-20th century, books copyright became an important resource, appearing in the field of international trade.

20世纪中叶后，随着知识经济的兴起，图书版权作为一种资源而进入国际贸易领域，并迅速席卷全球成为一种重要的国际贸易形式。

youdao

As Russia seeks to join the World Trade Organization, it may be forced to step in line with international copyright licensing and stamp out sites like AllofMP3.

FORBES: Yar! Why Web Pirates Can't Be Touched

The World Trade Organisation (WTO) last year declared the loophole in breach of international copyright law.

BBC: Songwriters win US copyright battle