plná moc spojená se zájmem/majetkovou účastí na věci/předmětu, kterého se dotýká

"Hence, in order to constitute a power coupled with an interest, the person clothed with it, must derive, under the instrument creating it, or otherwise, a present or future interest in the subject itself, on which the power is to be exercised, and not merely in that which is produced by the exercise of the power. Power coupled with an interest is not held for the benefit of the principal, nor it is irrevocable due to the agent’s interest in the subject matter. For this reason some authorities declare that it is not a true agency power. It is also called as power given as security or proprietary power."

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Note added at 13 Min. (2017-06-29 09:59:14 GMT)
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"By this phrase is meant a right or power to do some act, together with an interest in the subject-matter on which the power is to be exercised.

Law Dictionary: What is POWER COUPLED WITH AN INTEREST? definition of POWER COUPLED WITH AN INTEREST (Black's Law Dictionary)

http://thelawdictionary.org/power-coupled-with-an-interest/