No DRM system was ever developed for the CD, so all the music distributed on CDs can be easily uploaded to the Internet, then (illegally) downloaded and played on any computer or player.

CD上从来也没有过DRM系统，所以所有CD上的音乐都可以轻易传上互联网，然后被(非法地)下载到任何电脑上，在任何播放器上播放。

youdao

Since there is no common DRM standard, songs purchased for one type of music player may not work on another.

由于现在并无一个共同的数字版权管理标准，所以为这种音乐播放器购买的歌曲可能在另一种播放器上就听不了。

youdao

The problem with all DRM is that, to date, there has been no DRM system that actually works!

FORBES: Green Tech? Only 'Cause it's Not Ripe

Accordingly, a slate of torrent portals like Vodo offers consumers media choices that include outright ownership, no-DRM formats that are transferable to mobile devices, zero pricing, added-value bundles and in some cases rudimentary social discovery environments.

ENGADGET: Editorial: Legal torrent sites are innovators of media consumption

It's been nearly a year since DVD Jon made some noise about doubleTwist by promising to "liberate" iTunes purchases from their DRM, and while that's no longer particularly relevant in light of Apple's decision to go DRM-free, we're actually really digging this newly refocused public beta of the doubleTwist app, which promises to seamlessly manage all your devices from a single interface.

ENGADGET: DVD Jon's DoubleTwist device-management software enters public beta