Why Is It illegal to change the voice of the characters ?

As the titles says I really dont know why its not allowed to change the voices of champions from english to other langueges . I used in the past an app called LVOC and I found out it became illegal and I cant see the reason for it . To conclude I would like to change my champions lanugueges and would like to know if riot will support it in the future.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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