Technology known as digital rights management can make e-books unreadable once they have reached a certain time or user limit.
数字版权管理技术可以使电子图书在达到一定期限或使用限制后失效。
However, because Apple USES closed, non-standard technology for its copy protection (known as Digital Rights Management), the growth is seen as limited.
然而，由于苹果公司采用了封闭的、非标准的技术来实施版权保护(被称为数字版权管理)，其成长性受到了局限。
At issue is digital rights management (DRM) -the technology guarding downloaded music against theft.
问题的焦点是数字版权管理(DRM, Digital Rights Management)，即网上下载音乐的反盗版技术。
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