There are still restrictions on the manufacturors. Usually for the different DRM formats, the SDK gives you pretty much a ready made app for using with it, and you have to shoehorn your other stuff around it. Well, you start to have too many of these, you'll run out of space to store the binaries, since most embedded devices have a separate chip for the firmware, one that has much less space. The PRS-500 users are worried about this problem right now. The firmware update to add ADE support was not released for the 500, due to space restrictions.
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