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All of DVD was using BT.601 matrix. What you are talking about is the two other: transfer and primaries. The transfer is the same as BT.709. Primaries for digital video can be one of the two in BT.601 spec: SMPTE-C and PAL, last one is the same as in analog video spec BT.470 BG. BT.470 System M did change to SMPTE-C though, it was chromatically adapted from Illuminant C in System M to D65.
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