フリーランスデザイナー？コンセプトが自分のものだと証明する方法

You pitched three concepts. The client went quiet. Two months later, your design is on their website — credited to their "in-house creative team." No payment. No attribution. No recourse.

It happens to one in three freelance designers. And it keeps happening because most designers have no evidence that their concept came first.

The Pitch Is the Vulnerability

Every time you share a concept deck, mockup, or design exploration with a potential client, you're handing them your intellectual property on faith. If the engagement doesn't move forward, that concept lives on their device — unprotected.

Timestamping your designs before the pitch means you have a permanent record showing you created the work before the client ever saw it. This changes the dynamic entirely.

Build It Into Your Design Workflow

Before exporting a pitch deck: timestamp the source file. Before sending mockups: timestamp each deliverable. Before presenting concepts: timestamp the concept document.

This adds about 30 seconds per deliverable. Most designers spend more time naming their layers.

What to Do When It Happens

If you see your concept being used without authorization, your timestamp gives you leverage. You can demonstrate to the client (or their legal team) that you created the design on a specific date — before they claim to have developed it internally.

Most of these disputes resolve with a direct conversation backed by evidence. The ones that don't have a much clearer path to legal resolution when you can prove timing.