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As I understand it, the problem is that every manufacturer can just use the label »support for H.264 profile/level x/y« without any restriction. There are no procedures in place to ensure that such a device actually fully supports profile x and level y.
On the other hand you are only allowed to put a »DivX profile X« sticker onto your device if you’ve gone through the DivX certification process. So as a consumer the DivX profile label tells me exactly and (more important) reliably what the device is capable of.
Of course the full DivX profile specs should be freely available to everyone so that one can setup any encoder to produce compliant video. That might already be the case for current DivX profiles, I’ve never checked.
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