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Activity in public does not require a release. Search for "street photography" or read one of these: http://www.clickinmoms.com/blog/street-photography-and-the

• alistairSH 10y ago
  The first link indicates that the release isn't required to take the photo or use it in an editorial or educational context, but that one might be required to publish the photo commercially (which was done in the original link).