I doubt MMP would need to "buy" anything. It is MMP intellectual material that appears in the LFT charts.
Yes and no. Indeed, that could be an interesting legal fight, couldn't it. On the one hand MMP, or Hasbro, could sue LFT, FrF, BFP, BGD, Canuck and so on for copyright infringement. I am not a lawyer, but they could probably succeed. Succeed in bringing down their own business due to badwill and accelerate the decline of the hobby as the result of a much smaller number of interesting products.
As for the LFT charts, MMP could of course make a photographic replica of them and sell them. An even more interesting court case could ensue. MMP making illegal copies of a product owned by another company, but that product in turn being based on Hasbro intellectual property.
Or - which was the reason I wrote as I did - they could BUY the electronic files constituting the LFT charts and have a - maybe inexpensive - base for a future popular MMP product. They could even sell a bundle consisting of a Chart and Reading Glasses, popular in Montreal
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That MMP would spend development time to create an alternative Pocket Chart from scratch does not make sense to me.