Update faq.rst

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@ -18,6 +18,7 @@ To briefly review, **Alice** is the *data owner*. She wants to share some data w
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**Q: How much trust do we place in Ursula, the proxy?**
Ursulas are “semi-trusted” in the sense that Alice must trust Ursula to revoke a policy once it expires or if instructed to do so (by Alice). We also must trust Ursula to be responsive and perform the re-encryption correctly so that Bob can access the data.
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