Does the law even need to be changed though? Their duty is to pursue non-licensed use of their trademark. Could they not grant the innocent book seller in thi

Does the law even need to be changed though? Their duty is to pursue non-licensed use of their trademark. Could they not grant the innocent book seller in this case a non-transferable license for a specific purpose for a paltry sum? They would then reserve the right to pursue non-licensed infringement of the trademark.