What is the revocation file purpose ?
There is no "forgotten password" option
In the G1 currency system your wallet is not managed by a centralized organization. Everybody is responsible of the management of his or her own account. Nobody can retrieve your identification phrase and your password.
The Revocation file is a file you can download only on a computer (Cesium app for smartphone has a bug for the revocation file download).
What if you loose identification phrase and your password ?
If you can't access your wallet anymore, your G1s are lost for ever, and you account keeps creating money for nothing.
Same if you get hacked and someone accesses your co-creator account (wallet?). That would be a bummer to be creating money for some pirates...
You can't create a new member wallet to create money while your former account still creates money. The only way to go if you loose or get stolen your identification phrase and your password is to revoke your account by using the revocation file (you can find it in the options in your Cesium wallet).
It is important that your revocation file stays available somewhere even if your computer breaks or something happens to it, so copy this file on various devices (cloud, hard drive,...).
This document is based on the date of which you requested to become a member to co-create some G1 (=transform your simple wallet into a member account/wallet?). So if you had to start the process of request of membership a couple of times to get your final certifications (for example, if you didn't get the required number of certifications and your member wallet switched back into a simple wallet after the 2 months period), then you must re-download the revocation file (don't forget to delete the previous one).