Uv infos are stored in the obj file. If you remap the obj and save it, the new maps can only work with the proper obj.

As you can't distribute a modified version of someone else's obj, the only way you have to make other people use your textures would be to save the new uvs file others could apply to the original obj (without overwritting it of course :) ).
Not an easy way to redistribute something though.

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