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1: networked hopefully SMB with no extra client software

All the networked DVD players I've seen require their own special software to be running on the server.

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2: support for many formats: mpeg1/2/4, xvid,divx , etc

All the cheapo players have supported this for years now.

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3: dvd menu playback over network

This is the difficult one. Apparently if you want to get CSS keys from the DVD CCA then you have to block this feature.

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4: digitial connections a plus. HDMI or dvi.

Not too hard now. Lots of them are beginning to have this.

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5: upscaling a plus too

If you have #4 then chances are it'll upscale as well.