What is "poor man's copyright"?
"Poor man's copyright" is the practice of mailing a copy of your own work to yourself, usually by certified mail, and leaving the envelope sealed. The idea is that the postmark proves the work existed on that date, so if anyone copies it, you can open the envelope in court.
Variations include emailing a file to yourself, or having a document notarized.
Does poor man's copyright work?
Not the way people hope. The US Copyright Office addresses it directly:
"The practice of sending a copy of your own work to yourself is sometimes called a 'poor man's copyright.' There is no provision in the copyright law regarding any such type of protection, and it is not a substitute for registration." US Copyright Office, Copyright FAQ
Three reasons it falls short:
1. You already have copyright, envelope or not
In the US, copyright protection is automatic. According to the Copyright Office, your work is protected "the moment it is created and fixed in a tangible form." That means the moment it's written down, typed, recorded, or saved. Mailing it to yourself doesn't add any rights you didn't already have.
2. To sue, you need to register
Owning a copyright and being able to enforce it are different things. The Copyright Office notes that you have to register "if you wish to bring a lawsuit for infringement of a U.S. work." Registration timing matters too. Under US copyright law (17 U.S.C. § 412), statutory damages and attorney's fees are generally only available if the work was registered before the infringement began, or, for published works, within three months of first publication. An envelope in a drawer doesn't do any of that.
3. It's weak evidence
At best, a postmarked envelope shows that something was mailed on a date. It doesn't show who wrote it, and envelopes can be opened and resealed. It's better than nothing. It's much weaker than the alternatives below.
Can you copyright an idea?
No. This surprises a lot of people, but it's one of the clearest rules in copyright law. In the Copyright Office's words:
"Copyright does not protect ideas, concepts, systems, or methods of doing something." US Copyright Office, Copyright FAQ
Copyright protects expression: the specific words, images, sounds, or code you created. It doesn't protect the idea underneath.
An example: "A retired shepherd comes home to care for her mother, who has dementia" is an idea. Anyone can write a story with that premise. The actual screenplay you write, with its scenes, dialogue, and characters, is expression, and that's what copyright protects.
That's why two films with the same basic premise can both exist legally, and why the advice for protecting an idea is mostly about what you do with it, not about copyright.
So how do you protect an idea?
There's no single answer, because "an idea" can mean a story, an invention, a business, or a brand. Here's how the main options compare:
| Option | What it protects | What to know |
|---|---|---|
| Copyright registration | Your specific expression: a script, manuscript, song, design, or code | Protection is automatic, but registration with the US Copyright Office is needed to sue over a US work, and timing affects damages. |
| Patent | Inventions: new and useful processes, machines, and products | You can't patent an idea alone; a patent application has to describe how the invention works. The US has been "first-inventor-to-file" since March 16, 2013, so the filing date generally matters more than when you thought of it. A provisional application can secure an early filing date, and you then have 12 months to file the full application. |
| Trademark | Names, logos, and slogans that identify a business | Protects your brand, not the idea behind the business. |
| Keeping it secret | Information that's valuable because others don't know it | Works as long as you actually keep it confidential, for example with nondisclosure agreements (NDAs) and limited sharing. |
| Contracts when you pitch | An idea you share with a company or producer | A written agreement before you pitch is the strongest protection. Some states also recognize implied agreements in pitch situations, but don't count on it. |
| Script registries | A dated record of written material, like a screenplay or treatment | The WGA West Registry provides "a dated record of the writer's claim to authorship." It says itself that registration "does NOT take the place of registering with the Library of Congress, U.S. Copyright Office." |
| Dated records | Evidence of what you had, and when | Notebooks, emails, file histories, and timestamped records all help tell your story if there's ever a dispute. They don't grant any rights by themselves. |
What a timestamped record can and can't do
A dated record of your idea, whether it's a notebook page or a cryptographically signed receipt, is evidence, not protection.
It can:
- Show that specific text existed at a specific time
- Help you reconstruct your own timeline: when you had an idea, and how it developed
- Support your account if there's ever a dispute
It can't:
- Give you copyright, a patent, or a trademark
- Stop someone else from using the same idea (ideas aren't protected)
- Prove that someone copied you, as opposed to having the same idea independently
- Beat an earlier patent filing, since the US patent system generally looks at filing dates
The stronger the record, the more useful it is. A record that's hard to change after the fact, with a reliable date, beats an envelope in a drawer.
How Idea Baby Daycare's proof receipts work
Every idea you capture in Idea Baby Daycare gets a proof receipt the moment you save it, private ideas included:
- What it records: the time, and a SHA-256 fingerprint of the idea's original title and text. A fingerprint is a short code computed from your exact words. Change a single character and the fingerprint changes completely.
- How it's signed: the receipt is signed with an Ed25519 digital signature. Anyone can check that signature against our published public keys. Together with the daily anchor below, that means a receipt can't be quietly changed after the fact, even by us.
- Edits don't change it: you can keep rewriting your idea, and the receipt still records the original version and time.
- An independent anchor: every day, a combined fingerprint of the previous day's receipts is published to a public GitHub repository, outside our own servers. It contains only hashes and a count, never your words or your identity.
- Your words stay private: checking a receipt shows hashes and the time, never the content. To show that a text matches a receipt, you compare fingerprints.
- You can keep a copy: share a receipt from the app as text or as an image card with a QR code, download it from the idea as a text file, or download the JSON receipt from the public verify page.
Two honest caveats:
- The time comes from our server's clock when you save. The daily GitHub anchor independently pins each receipt to that day (in UTC).
- Receipts issued since July 23, 2026 use these public-key signatures and can be checked without relying on us. Older receipts work differently, and the earliest ones record when an idea was saved but not its words.
Be clear about what that means: it's a much better-documented version of a dated notebook entry. It isn't copyright registration, a patent, or legal protection for the idea, and nothing on this page should be read that way. Its best use is helping you keep an honest, verifiable record of your own creative history. Our idea journal guide covers the rest of that habit.
Before you pitch an idea: a practical checklist
- Write it down in detail, with a date, and keep the record.
- Develop it. The more of your own expression exists (a treatment, a script, a prototype, a plan), the more there is to protect.
- Register what can be registered. For a finished script or manuscript, that's the US Copyright Office. For an invention, talk to a patent attorney about a provisional application before you disclose it.
- Use an agreement. Ask for a written agreement, or an NDA where it's realistic, before sharing anything confidential.
- Pitch through proper channels. Many companies won't accept unsolicited ideas, and that's partly to protect themselves. Agents, managers, and official submission programs exist for a reason.
- Keep records of who you told, and when. Emails and meeting notes count.
- Get real advice when it matters. An hour with an intellectual property lawyer costs far less than a dispute.
Frequently asked questions
Is poor man's copyright legal?
It's legal to mail yourself your own work, but it isn't a form of protection. The US Copyright Office says there is "no provision in the copyright law regarding any such type of protection, and it is not a substitute for registration."
Can you copyright an idea?
No. US copyright law doesn't protect ideas, concepts, systems, or methods. It protects the specific way you express an idea, like the actual words of a script or the code of an app.
How do I protect my idea before pitching it?
Develop it into something concrete, keep dated records, register what can be registered, and get a written agreement or NDA before sharing confidential details where you can. For inventions, talk to a patent attorney before disclosing anything publicly.
Does a timestamp prove I had an idea first?
A reliable timestamp can show that specific text existed at a specific time. That's useful evidence, but it doesn't prove nobody had the idea earlier, doesn't prove anyone copied you, and doesn't give you legal rights to the idea.
Is WGA script registration the same as copyright?
No. The WGA West Registry provides a dated record of your claim to authorship, and says itself that it doesn't take the place of registering with the US Copyright Office. Many screenwriters use both.
Do I need to register copyright for my screenplay?
Your screenplay is protected by copyright as soon as it's written. Registering with the US Copyright Office is voluntary, but you'll need it to sue for infringement, and registering early affects what you can recover.