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# How to apply a license
NocoDB doesn't require a CLA (Contributor License Agreement).
We require Developer Certificate of Origin (DCO) as an additional safeguard
for the NocoDB project. This is a well established and widely used
mechanism to assure contributors have confirmed their right to license
their contribution under the project's license.
## Modifying existing file
If you modify an existing file, please keep the existing license header as
it is and just add your copyright notice and author:
````
@author <your name> <your email address>
````
## Creating new file
````
/**
* @copyright Copyright (c) <year>, <your name> (<your email address>)
*
* @author <your name> <your email address>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
````
## How to sign your work
````
Signed-off-by: FirstName Initials/Lastname <email@provider.com>
````
Use your real name (sorry, no pseudonyms or anonymous contributions).
If you set your `user.name` and `user.email` git configs, you can sign your
commit automatically with `git commit -s`.
You can also use git [aliases](https://git-scm.com/book/tr/v2/Git-Basics-Git-Aliases)
like `git config --global alias.ci 'commit -s'`. Now you can commit with
`git ci` and the commit will be signed.
## How to sign your previous work
In case you forget to sign your work, you can do the following:
```bash
# sign the last N commits - replace it before executing the command
git rebase HEAD~N --signoff
git push -f
```