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This is complicated so try to follow me. When someone breaches a confidentiality agreement, the aggrieved party (the party that was allegedly hurt) has claims for injunctive relief (e.g., a restraining order to prevent the use of the information) and for damages. If you had an agreement with Company A and you breached the agreement, then Company A could seek injunctive relief and damages. It is more complicated with Company B. It is unclear what confidentiality agreement Company B had with Company A. If there was an agreement, then Company B could sue Company A, and Company A would implead you (include you in the claim). However, even if you are liable both Company A and Company B would have to prove damages. This is usually done by showing how profits or revenue decreased (if they did) due to the breach. For a person to protect themselves in this situation, it is best to attempt to seek a release from liability when settling the matter. For example, if returning the disclosed document is a remedy, the party returning it (you) would attempt to seek a release from damages from Company A. Company B would be more difficult because there was no direct relationship with Company B and you (the alleged breacher of an agreement with A). In any event if Company B wants to sue, they would have to show that they had a confidentiality agreement with Company A and would need to show damages.
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