No, it is not possible to have a patent back dated. The searcher in 2006 most likely missed the 1994 patent which can happen for any number of reasons. It is not uncommon for a search to uncover a patent which used the same thoughts, ideas and even words. Good ideas address solutions for common problems which makes it more likely that others are working on solving the same problem and will likely arrive at the same solution.
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There is an exception to the "too late" conclusions of the other answers. If the first sale occurred less than one year ago, it may still be possible to file for patent protection. If the first sale was more than one year ago but could fall within the experimental use exception, there may also be time to file for patent protection. Contact and Experienced Patent Litigator ASAP.
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Be careful of answers that are too narrow, this is not strictly a trademark issue. In addition to trademark issues(Federal, State or common law), there may be additional legal recourse to address someone else assuming your name after you have been in business for four years. This is an unfair activity and the law may provide redress in the form of remedies, such as business tort, unfair competition, fraud, passing off, unjust enrichment, and various statutory remedies depending on your state...
It is illegal. This is not a close question. It is also likely that someone in the movie industry will eventually start suing these viewers, just as the music industry sued students that download music.
Do you have a patent or a patent application in the US or in Australia? When did you develop the invention, when did you disclose it and when was it taken and when did it appear in the US?