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To my understanding in a 1-n Oblivious Transfer the Sender has some Values $X_1...X_N$ and the receiver wants to retreave some $X_I$, with $1 \le I \le N$.

Can one now somehow guarantee, that the Receiver has the permissions to retreive said $I$? Assuming every receiver has some rights to receive exactly one certain $I$, and no other Receiver has them. I think keeping the possible $I$ values secret would be insecure and not an option.

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You mean oblivious transfer with access control? –  DrLecter Mar 31 at 11:36
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One could use Oblivious Signature-Based Envelopes. $\;$ –  Ricky Demer Mar 31 at 13:47
    
Both methods were helpfull, thank you. –  WeGi Apr 1 at 9:51

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