WIPO Proof
Standard YouTube Licence Jane Lambert A time-honoured way of proving the existence of a document on a particular day is to place it in a sealed envelope and post it to oneself or a trusted third party. The envelope would bear a postmark proving the date and place of posting of the envelope. If the seal was intact and there was no obvious tampering with the envelope it would prove that the ideas expressed in the document existed on the date of posting. Often it proved other things such as the originator of the idea or at least the author of the document. In the United States, the exercise was called a "poor man's patent" possibly because it could sometimes identify the person who was entitled to apply for a patent before the Leahy-Smith America Invents Act (Public Law 112-29 26 Sept 2011) . However, it was and is used here to prove the authorship of a copyright work or the originator of a trade secret. The system of source code escrow is simply a refinement of