BEIJING—They may be blocked from watching YouTube, but China’s 751 million internet users can binge on real-time video streams of yoga studios, swimming lessons, alpaca ranches and thousands of other scenes captured by surveillance cameras.

Much of what’s available would be unthinkable in the West, according to legal experts, because people dining out, taking dance classes or shopping for lingerie would likely object to having their live images beamed publicly, and doing so without their permission could invite litigation.

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