Poor Man's Copyright: Does Mailing It to Yourself Work?
The advice has been passed around for generations: put your manuscript, song or invention sketch in an envelope, mail it to yourself, and never open it. The postmark supposedly proves you had it first. Unfortunately it does not do what people think.
Not legal advice. This page is general information from a software company, not from a law firm. Examples are mostly from US law; rules differ by country. If the stakes are real, talk to a qualified IP attorney.
What the U.S. Copyright Office says
The Office addresses the practice directly in its general FAQ. Its answer: there is no provision in copyright law regarding this type of protection, and it "is not a substitute for registration."[6] The same FAQ explains why you do not need a trick to have copyright in the first place — your work is protected from the moment it is created and fixed in a tangible form.[6] That is the rule in practically every country, because the Berne Convention forbids making protection depend on formalities.[10]
So the envelope solves a problem you do not have (getting copyright) and fails at the one you might have (proving your case).
Why a sealed envelope is weak evidence
- The postmark dates the envelope, not the contents. Anyone can mail themselves an unsealed or lightly sealed envelope and put something in it later. The other side's lawyer will say exactly that.
- The evidence is in the custody of the interested party. It sits in your drawer for years. Good evidence of a date is something a third party holds or anyone can check.
- It can be verified only once. Opening the envelope destroys the seal. You cannot show it to a potential licensee, then to a lawyer, then to a court.
- It does nothing for legal remedies. For United States works you still cannot sue without a registration[7], and you still cannot claim statutory damages or attorney's fees without a timely one.[8]
"Poor man's patent" is worse
The same trick is sometimes recommended for inventions. Here it fails on the law as well as on the evidence. Since 16 March 2013 the United States has granted patents to the first inventor to file[3], as most of the world already did. Proving that you thought of something earlier does not give you priority over someone who filed before you. The genuine low-cost step for an invention is a provisional patent application, which secures a filing date for 12 months.[2]
What works better
1. Register the copyright (for finished works that matter)
Registration with the U.S. Copyright Office costs $45 for a single author registering one work online, or $65 for the standard application.[4] It is the only option here that unlocks US lawsuits and statutory damages. See timestamp vs copyright registration.
2. A cryptographic timestamp (for everything, including drafts)
A blockchain timestamp is what the envelope was trying to be. Instead of a postmark, a SHA-256 hash of your file is written into the Bitcoin blockchain. It fixes each weakness of the envelope:
- The hash is tied to the exact content. Change one character and it no longer matches.
- The record is held by thousands of independent nodes, not by you.
- It can be verified any number of times, by anyone, without damaging anything and without revealing the content until you choose to.
You can do this for free with OpenTimestamps if you are comfortable with command-line tools.[12] A service like icalledit.io charges $19 and gives you a certificate, a verification page and a proof.json you can check without us.
Be clear about the limit it shares with the envelope: a timestamp is evidence of a date. It does not prove you are the author, it gives no exclusive rights, and it does not replace registration.
3. Ordinary good habits
Keep dated drafts and version history. Send work to collaborators by email rather than handing over a USB stick. Put agreements in writing. In real disputes, a consistent paper trail from several independent sources is what persuades — no single magic document does.
Side by side
| Envelope to yourself | Blockchain timestamp | U.S. copyright registration | |
|---|---|---|---|
| Ties the date to the exact content | No | Yes | Yes (deposit copy) |
| Held by someone other than you | No | Yes — public blockchain | Yes — government office |
| Can be checked repeatedly | No | Yes | Yes |
| Unlocks US lawsuits / statutory damages | No | No | Yes[7][8] |
| Cost | Postage | Free (DIY) or $19 | $45–$65 online[4] |
Bottom line
Skip the envelope. If the work matters commercially, register it. If you want dated proof of drafts, versions and things you are about to share, use a cryptographic timestamp. And if it is an invention, talk to a patent attorney about filing.
Quick answers
Is poor man's copyright legal?
It is not illegal, it is just ineffective. The U.S. Copyright Office says there is no provision in copyright law for this type of protection and that it is not a substitute for registration.
Need dated evidence today?
One registration is $19, one-time. You get a Bitcoin transaction, a PDF certificate and a proof.json you can verify without us.
Timestamp your idea → See pricing← Back to the full comparison of all methods
Sources
Official and primary sources for the facts on this page. All accessed on 20 September 2026. Fees and processing times change — check the source before you rely on a number.
- USPTO — Provisional Application for Patent (12-month pendency, not examined, "patent pending") — https://www.uspto.gov/patents/basics/apply/provisional-application
- USPTO MPEP § 2159 — first-inventor-to-file provisions took effect on 16 March 2013 — https://www.uspto.gov/web/offices/pac/mpep/s2159.html
- U.S. Copyright Office — Fees ($45 single author/one work, $65 standard application, $125 paper) — https://www.copyright.gov/about/fees.html
- U.S. Copyright Office — Copyright in General FAQ (protection from the moment of fixation; "poor man's copyright") — https://www.copyright.gov/help/faq/faq-general.html
- 17 U.S.C. § 411 — registration before an infringement action for a United States work — https://www.law.cornell.edu/uscode/text/17/411
- 17 U.S.C. § 412 — registration as a prerequisite to statutory damages and attorney's fees — https://www.law.cornell.edu/uscode/text/17/412
- WIPO — Summary of the Berne Convention (protection may not be conditional on any formality) — https://www.wipo.int/treaties/en/ip/berne/summary_berne.html
- OpenTimestamps — free public calendar servers, Bitcoin-based — https://opentimestamps.org/