Well, I guess reasonable notification that would get to a wide variety of people whose whatever they had was about to be photographed...maybe not just a newspaper, but maybe some radio advertisements or interviews, things that would get people's attention, so that if they had a problem, they would know how to get in touch with the company.
In terms of blurring technologies, I think we had about a two-year discussion between some of the specialists in my office and Google about the strength of their swirl technique and whether or not it could be unswirled. Do you remember the case of a gentleman who had gone to Thailand and then his swirl was unswirled? That took a while to settle, but it seems to be a fairly strong technology now.