Zorgman - when you have a patent you are not obligated to enforce the patent. They are quite within their rights to sit on it and do nothing until they feel like enforcing. Just like they can choose who they go after and who they don't - e.g. avoid Microsoft and come after people round here intsead.
In actual fact as I understand it Acacia acquired the patent a few years ago - they haven't had it since 1991 anyway...
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