Thanks to reader Jim for Bob Fernandez's Golf Channel story in the Philadelphia Inquirer, which notes this:
The recently released Golf Live Extra app is available only in Comcast cable-TV markets, such as Philadelphia.
But the Golf Channel plans eventually to make it available to subscribers of other pay-TV services. Customers will have to authenticate that they are cable- or satellite-TV subscribers for access to the Golf Live stream - as they did to access the NBC streaming of the Olympics.
"There were people for years who wanted to watch golf on Thursday or Friday but couldn't because they couldn't get to a TV," because they were at the office. Now they can.