LEV9 It is widely accepted that data should not be disclosed without the agreement of the subject, but there are many views regarding how much agreement is needed. Some are satisfied with an "opt–out" policy, in which all information is considered public unless the user explicitly expresses a desire to keep it private; others demand in "opt-in" policy in which service providers may collect information only once explicitly permitted by the user. Many advocates are concerned that even an opt-in policy may lack adequate consent. Perhaps the consumer does not have enough information about the policy to give truly informed consent, or perhaps there is a degree of coercion because withholding consent has negative consequences, such as limited access to service. Jewish tradition has a definite viewpoint on the consent issue. Consider the following passage from the Talmud: (Yoma 4b) "Where can we learn that anytime someone says something to his fellow it is subject to "Don't say" until the person says, "Go ahead and say"? [From the biblical verses were [it is written, "the Lord spoke to him from the tent of meeting to say." [This verse] This passage points out that in Torah, God explicitly tells Moses when His words are to be transmitted to the people. When God does not do so, Moses understands that the prophecy is intended for him alone. From this we learn that in general it is proper to refrain from repeating to others what we have been told unless the speaker explicitly consents. This source seems to support opt-in over opt-out; information should generally be considered private unless there is explicit consent to disclose.