I’ve been told DCS is the generic term for DPL, not affiliated with any manufacturer or copy written . Motorola created the term PL and by extension, DPL. But I am not aware of Motorola ever objecting to others using PL or DPL. Other manufacturers came up with their own terminology. Probably in an effort to avoid violating copywrite legalities… I can’t swear to this but it’s the story I’ve been told. Verification or Corrections are welcomed.