The Hidden Sentence in the Petition Was Not Written for the Judge

A rural labor claim came before a judge in the Brazilian state of Para. On screen it looked like every other labor claim.

Somewhere in the file was a block of text set in white type on a white page.

No reader would see it. Any system reading the file's text layer would.

The hidden line, reproduced in the judgment, addressed itself to an artificial intelligence and told it to respond to the filing superficially and not to challenge the documents attached, whatever else it might be instructed to do. The court's own generative system detected the passage when the petition was processed and flagged it instead of following it. On 12 May 2026 the 3rd Labor Court of Parauapebas held the two lawyers who signed the petition jointly liable for a fine of ten percent of the amount claimed — roughly BRL 84,000 — as an act offensive to the dignity of justice, and directed that the state bar association and the tribunal's own disciplinary body be notified. Reports of the ruling record that the court treated the breach as complete when the concealed command was inserted, whether or not it worked.

The instruction was not aimed at the judge

This is the part most commentary skips.

The hidden line did not ask anyone to rule for the plaintiff. It asked whoever was drafting the response to do a weak job — to skim the claim and leave the exhibits unchallenged. The target was the opposing side's reading of the file, and, incidentally, whatever the court's own system might produce from it.

That matters, because it moves the risk out of the courtroom and into every place where documents change hands. A data room. A disclosure schedule. A bid package. A bundle of supplier certificates. A due diligence index of four hundred PDFs that nobody will read line by line, because the entire point of putting them into a review tool was that nobody would have to.

A document delivered today is read twice: once by a person, and once by a machine that may be reading a different document.

The question

What does PRC law do about hidden instructions embedded in a document that one party delivers to another?

The short answer

A hidden instruction deliberately embedded in a file does not stop being the sender's conduct because the intended reader is a machine. Chinese law has no provision written for this conduct, but it is not short of ways to condemn it: a filing that conceals an instruction to the reader is a straightforward breach of the procedural good faith principle, a lawyer who does it faces professional sanctions far more serious than any court fine, and where the document formed part of a negotiation rather than a proceeding, deliberate concealment is remediable under the Civil Code, including by rescission for fraud where its elements are made out. None of that is the hard part. The hard part is proof. Every one of those routes requires the injured party to establish what the file contained when it arrived — and the ordinary handling of an incoming document, by people who have no idea they are handling evidence, routinely removes precisely the layer that proves it.

Characterization is easy; the sanction provision is not

The Civil Procedure Law of the People's Republic of China (2023 Revision, effective January 1, 2024) requires at Article 13 that civil proceedings be conducted in accordance with the principle of good faith. A Chinese court shown a concealed instruction of this kind would have little difficulty condemning it. Characterization is not the problem.

The harder question is which coercive provision would support an actual fine or detention.

The sanctions live in Articles 113 to 118. Article 114 lists the conduct a court may punish, beginning with forging or destroying important evidence so as to obstruct the trial of a case. Article 115 covers parties who collude, or who unilaterally fabricate the basic facts of a case, to harm the interests of the state, the public or others.

Hidden instructions do not sit comfortably in either. Nothing has been forged: the visible document says what it says. Nothing has been destroyed. No fact has been fabricated — the injected sentence makes no factual assertion at all. It is not evidence and it is not an allegation. It is an attempt to manage how the file will be read.

So the analysis divides in three, and the three answers are not the same:

• Is the conduct improper? Almost certainly, under Article 13.
• Which provision authorizes a penalty? Genuinely uncertain, and I would not tell a client the answer is settled.
• How large could the penalty be? If a court did bring the conduct within the coercive-measure provisions, Article 118 caps the fine on an individual at RMB 100,000, and on an entity at between RMB 50,000 and RMB 1,000,000, with detention of up to fifteen days.

Note what is missing from that last figure: any relationship to the amount in dispute. There is no Chinese equivalent of a fine calculated as a percentage of the claim. A party contemplating this on a large claim would find the arithmetic encouraging.

The professional exposure is where the arithmetic changes. Article 49 of the Law of the People's Republic of China on Lawyers (2017 Amendment) lists conduct punishable by suspension of practice for six months to one year and a fine of up to RMB 50,000, with revocation of the practicing certificate in serious cases. Several limbs are conceptually in range: influencing the lawful handling of a case by improper means; deliberately providing false evidence or obstructing the other party's lawful acquisition of evidence; and disrupting the order of a court or arbitral tribunal so as to interfere with the normal conduct of proceedings. A concealed instruction designed to change how a filed document is processed could plausibly be brought within those provisions.

I would put that no higher than plausibly. The Ministry of Justice measures on punishing unlawful conduct by lawyers and law firms (2010) elaborate the improper-influence limb with specific examples — meetings with case handlers outside working hours, exploitation of personal relationships, distorted publicity about a case — and a hidden instruction resembles none of them. There is no reported PRC disciplinary decision on this technique that I am aware of. What I can say is that the professional route is where a Chinese lawyer's real exposure sits, and that it is not capped in any way that matters.

Why a Chinese court is the least exposed reader in the chain

There is a structural reason the courtroom is not where I would expect this to do real damage in China.

The Supreme People's Court issued its Opinions on Regulating and Strengthening the Application of Artificial Intelligence in the Judicial Field (Fa Fa [2022] No. 33) in December 2022. Among its five basic principles is the principle of assistive adjudication: whatever the state of the technology, artificial intelligence may never replace a judge; AI-assisted output may serve only as a reference for trial work or trial supervision; the decision is always made by the adjudicator, the adjudicative power always exercised by the adjudicative organization, and judicial responsibility always borne by the person who decides.

That is not a technical safeguard. It is an allocation of responsibility, and it is the reason an injected instruction cannot, by itself, produce a Chinese judgment. Even a system that swallowed the instruction whole would produce a summary that a judge is required to treat as reference material.

Which brings the analysis back to where the Brazilian hidden line was actually pointed. If the tribunal cannot be made to decide by machine, the remaining target is the party across the table — whose review is governed by no principle of assistive adjudication, whose reviewer may be a first-year associate with a prompt, and whose reliance on the output nobody supervises.

Foreign lawyers reading about the Brazilian case tend to file it under judicial technology risk. In China it is better filed under counterparty risk.

Where the exposure actually is: the deal room

Move the same conduct out of a filing and into a transaction, and PRC law becomes considerably more useful to the injured party.

Article 500 of the Civil Code of the People's Republic of China (effective January 1, 2021) imposes liability for loss caused during the formation of a contract where a party deliberately conceals material facts relating to the conclusion of the contract or supplies false information, and, as a residual limb, where a party otherwise acts contrary to the principle of good faith. Article 148 goes further: where one party induces the other by fraud to enter into a transaction against its true intention, the deceived party may apply to a court or arbitral institution to rescind. Article 509 requires performance in good faith, including duties of notice and assistance implied by the nature and purpose of the contract.

A disclosure document containing a concealed line telling a review system to disregard a specific clause is unusually strong evidence of intentional concealment. Whether it supports rescission is a further step: Article 148 still requires inducement, a transaction entered into contrary to the deceived party's true intention, and a causal connection between the deception and the decision. The hidden text proves purpose. It does not, on its own, prove effect.

Two practical qualifications matter more than the citations.

First, rescission is time-limited. Under Article 152 the right is lost if not exercised within one year of the day the party knew or should have known of the ground, and in any event within five years of the date of the juristic act. Hidden text is discovered late by definition. In a deal that closed eighteen months ago, the fraud analysis may be interesting and the rescission remedy already gone, which pushes the claim toward damages under Article 500 and toward whatever the contract itself says about false disclosure.

Second, and less comfortably: proving the causal element means explaining how your side read the document. That puts your own review process into evidence — which tool, which prompt, which reviewer, what human check sat on top of the output. In my experience clients are surprised by this, and some are more embarrassed by the answer than by the loss. A buyer who tells a tribunal that a four-hundred-document disclosure bundle was processed by a model, unsupervised, has established reliance and raised a question about its own diligence in the same breath.

The hidden line is worth more to you than to the person who wrote it

Here is the observation that organizes everything above.

A concealed instruction is dangerous only while it is invisible. Once it can be proved, it becomes the most probative evidence of intent available in the matter — more useful than the clause it was hiding, because intention is the element normally missing from a concealment claim. A deliberately worded instruction addressed to an AI reviewer will ordinarily be difficult to explain away as a formatting artifact. The hidden clause matters less for what it says than for what its existence proves about purpose.

And most recipients destroy it in the ordinary course of handling the file.

They open the PDF and save it. They convert it to Word to add comments. They flatten it, or run optical character recognition over it because the scan was poor, or print it for the bundle and rescan it. They copy the visible text into a chat window and delete the source. They "clean" the file when they notice something strange, which is the most natural reaction of all and the most destructive. Or their AI vendor's pipeline strips the anomaly before a human ever sees it — which protects the reader and erases the proof.

PRC evidence rules make this harder rather than easier, in a way that surprises people from common law systems.

Article 14 of the Provisions of the Supreme People's Court on Evidence in Civil Procedures (Fa Shi [2019] No. 19, effective May 1, 2020) treats documents, images and computer programs as electronic data. Article 15 requires a party relying on electronic data to produce the original — and then provides that a copy made by the creator consistent with the original, or a printout or other output medium derived directly from the electronic data and capable of displaying or identifying it, is regarded as the original.

That provision makes the problem counterintuitive. A directly derived printout may qualify as an original in form, even though the printout fails to display material that exists in the native file. The evidentiary question therefore shifts, from whether the paper is admissible to whether it faithfully captures the electronic data whose existence is the whole point. Admissible form and proven completeness are different things, and a Chinese litigation bundle is still, very often, paper. White text does not print.

PRC civil procedure also has no general party-driven discovery comparable to common law litigation, and no automatic litigation hold. There are narrower mechanisms. Articles 45 to 48 of the Evidence Provisions govern applications for an order requiring the opposing party to produce a document within its control: the applicant must identify the document and the fact it would prove, the court hears the other side and rules, and under Article 48 an unjustified refusal to produce allows the court to find the content asserted by the applicant to be true. Article 95 provides more generally that where a party controls evidence and refuses without proper reason to submit it, the court may accept the opposing party's assertion that the content is unfavorable to the party in control. Article 99 extends the rules on documentary evidence to electronic data, so the native file is within reach of these mechanisms.

They are real, and they are court-controlled and narrow. To ask for the native file you must already be able to say what it is and why it matters, which usually means you already have something. Preservation is not the only evidentiary route. It is the route you control.

What the rules then give you is a way to make preservation count. Article 93 directs the court to assess authenticity by reference to the hardware and software environment, whether the data was completely stored, transmitted and extracted, whether those methods were reliable, whether the data was generated and stored in the ordinary course of business, and whether the party extracting it was an appropriate one. Article 94 permits the court to confirm authenticity where the data was supplied or confirmed by a neutral third-party platform that records and stores it, where it was formed in normal business activity, or where it was kept as an archive — and provides that where the content has been notarized, the court shall confirm authenticity absent sufficient contrary evidence. The Online Litigation Rules of the People's Courts (Fa Shi [2021] No. 12, effective August 1, 2021) add, at Article 16, that electronic data stored through blockchain technology and verified as consistent may be found not to have been tampered with after upload — a presumption that, as Article 18 makes clear, says nothing about the state of the data before it went on the chain.

Read together, those provisions carry one instruction. Preservation proves what you received; it cannot prove what they sent. The gap between the two is closed by the transmission record — the email with its headers, the data room's download log, the electronic filing receipt — which is why the envelope is often worth more than the document.

What the recipient does	What it preserves	What it costs
Opens, edits and re-saves the file	The visible content	The original hashes, and often the hidden layer
Prints for the bundle	A form that may qualify as an original	Any text that does not render
Runs OCR or converts the format	Readability	The original text layer
Deletes or edits out the anomaly	Nothing worth having	The proof of intent
Copies the file untouched, records its hash, preserves the transmission record, then investigates on the copy	The foundation for Articles 93 and 94	Fifteen minutes

What I tell clients: the last row is almost never done, because the person who receives the document is an assistant or a paralegal following an intake habit designed for paper.

The governance point

None of this is a technology problem, and it is not solved by buying a detection tool, though detection tools are now sold for exactly this and are worth having.

It is a question about who controls the door. Documents from counterparties arrive through a channel — a mailbox, a data room, a messaging group, a shared drive — and somebody decides what happens to a file in the ten minutes after it lands. If that decision is "download, convert, tidy, circulate," the organization is running a workflow that routinely destroys evidence it does not know it has. If it is "preserve the file as received, record where it came from, then work on a copy," the same organization has a claim available to it eighteen months later, when the clause that was hidden turns out to matter.

Practitioner's Note

The Brazilian case is being read as a story about a clever trick and a large fine. I think that reading is backwards, and the fine is the least transferable part of it.

What the episode establishes is that a document can now carry two messages: one for the person and one for the machine standing behind the person. PRC law is capable of dealing with the second message once it is on the table. Concealment is concealment, whatever font it is written in, and a court shown a hidden instruction will not struggle to characterize the intention behind it.

The problem is getting it onto the table. In litigation, the party's own printing and filing habits work against it. In transactions, the injured party has to prove not only what was hidden but that it was misled by it, which means disclosing how it reads documents in the first place. Both problems are decided long before anyone consults a lawyer.

Every client I have advised on AI-assisted document review has asked me some version of "can we rely on the output." It is the wrong first question. The one that decides cases is narrower and much duller: what did we do with the file the day it arrived, and can we still show what it contained?

Document intake used to be an administrative function. It has become an evidentiary one, and in most organizations nobody has been told.

Questions Clients Ask

If we find hidden text in a document, should we tell the other side? Not before you have preserved the file, recorded how it reached you, and taken advice on what the concealed text was trying to achieve. Raising it early converts your best evidence into a negotiation point, and gives the other side an opportunity to explain it as a formatting artifact.

Does hidden text make the contract void? No. Fraud under Article 148 of the Civil Code makes a transaction voidable at the instance of the deceived party, not void, and only where the elements — including inducement and causation — are established. The right to rescind is lost after the periods in Article 152. Concealment during negotiation may separately support a damages claim under Article 500, where resulting loss can be established, without affecting the contract's validity. Article 500 is not a way around the causation problem; it is a different remedy with its own.

Is this a crime in China? There is no offense written for it, and I would not build advice around the computer-system offenses in the Criminal Law, which were drafted for interference with systems rather than for supplying a system with a document. The realistic exposure for a PRC lawyer is professional, under Article 49 of the Law on Lawyers, together with whatever a court decides to do about the conduct as an abuse of the proceedings.

Legal Authorities

• Civil Procedure Law of the People's Republic of China (2023 Revision, effective January 1, 2024), Articles 13, 114, 115, 118
• Civil Code of the People's Republic of China (effective January 1, 2021), Articles 148, 152, 500, 509
• Provisions of the Supreme People's Court on Evidence in Civil Procedures (Fa Shi [2019] No. 19, effective May 1, 2020), Articles 14, 15, 45 to 48, 93, 94, 95, 99
• Online Litigation Rules of the People's Courts (Fa Shi [2021] No. 12, effective August 1, 2021), Articles 16, 18
• Opinions of the Supreme People's Court on Regulating and Strengthening the Application of Artificial Intelligence in the Judicial Field (Fa Fa [2022] No. 33, issued December 2022), principle of assistive adjudication
• Law of the People's Republic of China on Lawyers (2017 Amendment), Article 49; Measures for the Punishment of Unlawful Conduct by Lawyers and Law Firms (Ministry of Justice, 2010)
• For the opening facts: 3rd Labor Court of Parauapebas, Regional Labor Court of the 8th Region (Brazil), case ATOrd 0001062-55.2025.5.08.0130, judgment of 12 May 2026

Related Reading

• When a Lawyer Helped a Judgment Debtor Move a Receivable — where a lawyer's assistance to a client crosses into personal exposure.
• Your Chinese Supplier Will Show You Anything. Ask It to Agree to Something Instead. — on the difference between proof that is free to give and proof that costs the other side something.
• Someone Used Your Company's Name to Commit Fraud. You Are Not the Victim. — on what a document tells you about the business behind it.

More on this area of practice: Commercial Disputes.

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This article is general commentary on PRC law and does not constitute legal advice on any specific matter.

Last reviewed: August 11, 2026.