As Harry said, Good Luck.
This is something those of us with Tivos have been experiencing forever. Cox lifted the restriction for a month or 2 a few years ago but then went back to only the Locals being copy freely and has been that way since.
Here is a thread about it from 2011:
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[CATV] [AZ] Need help from a cox employeeand another:
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[CATV] Can you pressure Cox to remove copy-once flagging?Luckily it does not affect streaming between Tivo's.