I read their General Terms and Conditions (AGB) in German and for sure there is stated that you can use the purchased items for all of your work as long it is ensured that it is not possible to extract the original content out of your work. So, send an e-mail to the seller with the link to their AGB (German expression for General Terms and Conditions). May be the seller didn't read them 'cause not only the customer, also the seller has to ensure that he understands the AGB and if not, he/she has to send an e-mail to the store that they can explain it to him/ her.

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Ulli

"Never argue with an idiot. They drag you down to their level and beat you with experience!"