A no-DRM clause would go against the definition of both Free Software and Open Source. Or more exactly, if you apply any restrictions on usage, then the softwar

A no-DRM clause would go against the definition of both Free Software and Open Source. Or more exactly, if you apply any restrictions on usage, then the software can't be classified as either. No exceptions. And on distribution any copy left license would do, because it is DRM ruling itself out, as transparency of the code is incompatible with DRM. That's because all DRM accomplishes is a sort of security by obscurity so there can't be generally accepted solutions that are open-source. There's no DRM in Chromium for example. But except for the browser, it's not distribution that's relevant, which is why organizations like the FSF, the EFF and Mozilla are pissed off about W3C standardizing DRM. I wouldn't hope for any miracles by Apple, when they are single handily responsible for popularizing DRM amongst consumers, along with Trusted Computing. Their whole iTunes / iPhone business is built on top and the rest of the industry followed.