This can be hard from your POV, but limiting people to share information is usually not good. To resolve this conflict of intelectual slavery, you could try to shift business to new models that do not require denying usres from freely talking or sharing.
Maybe some extra options, comments, or even crowdsourcing. If this is at all possible in your case, then such model removes the problem while keeping both sides of trade happy.
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This can be hard from your POV, but limiting people to share information is usually not good. To resolve this conflict of intelectual slavery, you could try to shift business to new models that do not require denying usres from freely talking or sharing. Maybe some extra options, comments, or even crowdsourcing. If this is at all possible in your case, then such model removes the problem while keeping both sides of trade happy.