we reserve the right to charge you a minimum of € 500的意思是什么

we reserve the right to charge you a minimum of € 500的意思是什么
这段话是从一份插画使用合同里摘出来的,
We require 1 copy of the publication or a tear sheet with image and credit line for our files
Copyright-fee € 150.-
Handling € 30.-
Electronic image *) € 75.-
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*) High resolution € 255.-
Printing our copyright notice with the illustration (or in the acknowledgement section of the publication) is one of the main conditions of our authorization to reproduce M.C.Escher's work.Note:we reserve the right to charge you a minimum of
€ 500.- if for whatever reason our credit-line has not been printed.
请问上面的一句话的意思是不是说不论使用几张图,最少要给500欧呢,
不太明白他的最后一句话的意思
到底是说不论使用几张图片，最低500欧，还是说（注意：不管因何原因，如果我们的署名没有被打印在出版物上，那我们将保留向您收取最低500欧元的权利。）