It involves scope of copyright protection and a wide variety of related issues which is generated works to free use.

自由使用是世界各国著作权法中的一个重要概念，涉及到著作权保护范围及作品如何使用引发的各种相关问题。

youdao

The demo we saw showed reasonable performance here, but we still have a difficult time finding a usage scenario that involves us using this particular feature (especially when it's ever-present in a wide variety of phones and tablets now).

ENGADGET: Novatel Wireless MiFi Liberate MiFi for AT&T hands-on