Where the duty comes from
A breach of confidentiality claim usually rests on something specific, such as a nondisclosure agreement, a confidentiality clause in an employment or vendor contract, a fiduciary relationship, or trade secret law. Some relationships, including those with doctors and lawyers, carry duties of confidence even without a signed agreement. The real fight is often over what counts as confidential, because information that is public, widely known in the industry, or never treated as secret may not be protected however the contract labels it. Courts also look at whether the owner took reasonable steps to keep the information private. The answers vary with the type of claim and the state whose law governs the contract.
Preserving the trail without making it worse
If you are the company, preserve email, access logs, device records, and any messages showing what was taken and where it went, and suspend routine deletion that might erase them. Do not search the person's personal accounts or devices yourself, which can create legal problems of its own. If you are the person accused, keep your own messages and a copy of the agreement you signed, but do not delete files, wipe a device, or move company material without advice, since how that is done can matter later. Both sides should reconstruct the timeline: when access was granted, when it ended, and what was said at departure.
Choosing a proportionate response
Many of these disputes are resolved by letter, a return-and-certify arrangement, or a negotiated agreement without a lawsuit. When information is still spreading, a court can sometimes be asked for fast interim relief, and that request depends on moving promptly and showing concrete harm. Damages, contractual remedies such as fee-shifting clauses, and claims against a new employer who benefited are separate questions. In an initial meeting we read the agreement, pin down what information is really at issue, and weigh what the dispute is worth against the cost of pursuing or defending it. If a criminal theft question or a privacy regulation is involved, we flag that as well.
