As with most legal hacks, the courts figured this one out long ago :).

If someone is trying to dig into their competitor's trade secrets via discovery, the court offers multiple ways to safeguard against that. The defendant can identify information as a trade secret and ask that it be protected in some way - for example, the documents may be restricted to "Attorneys' Eyes Only", so while the plaintiff's attorneys can review the material, the plaintiffs themselves are barred from reviewing it. Or the judge themselves may get involved in an in-camera session.