Further to Outlaw's point, the Witnessing in Public Places letter says:
Any application to use a mobile cart or to set up a table or kiosk to display literature must be filled out in the name of an individual publisher, not in the name of the congregation, any corporation used by the organization, or “Jehovah’s Witnesses.” If a small administrative fee is needed in order to acquire space in a public area, it is to be paid by the individual publisher, not the congregation. Publishers should carefully review any such applications to see what responsibility they are taking upon themselves with respect to liability and possible proof of insurance coverage. Publishers who apply to distribute literature at these areas are doing so on their own initiative as part of their personal ministry.The bolding is mine, to emphasis that WTBTS is putting all legal liability on the individual.
However, the letter goes on:
After consulting with the other elders, the Congregation Service Committee will make the final decision as to specific locations for public witnessing.
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Locations selected for public witnessing must be within the congregation’s territory boundaries.
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The service overseer or someone else designated by the body of elders should determine what may be legally required, if anything, in the way of permissions, permits, and insurance coverage.
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The Congregation Service Committee will determine what equipment (including posters) will be used and where it will be stored. Only artwork approved by the branch office should be displayed.
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The [public witnessing] equipment will remain the property of the congregation. Care should be taken to request only equipment that will be put to good use by publishers who have been trained in its use and that can be financially supported by the congregation. The congregation may be informed that the cost of the public witnessing equipment will be covered by their contributions to the worldwide work.
...There is more. I can't be bothered cutting and pasting it. Surely, given the very prescriptive requirements and the fact that individual JW's use Watchtower logos and intellectual property, this letter is evidence that WTBTS is in complete control. The legal ramifications could be interesting.
Determining Who May Participate: The Congregation Service Committee will select qualified publishers to participate in this feature of the ministry. Those selected should be... [blah blah blah]
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If it is possible and practical, the service overseer or someone designated by the body of elders should organize a midweek and weekend schedule for each selected location.
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It is usually best for two or more persons to be assigned to work together.