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When distributing your plugin to others, it's important to have a clear license so that you both protect your own copyright and make sure anyone who receives your plugin has a clear understanding of what their rights are. WordPress is licensed under the GNU General Public License (GPL), version 2 or later. Any plugins distributed should use a license that is compatible with the GPL.

The GPL recommends placing the following copyright notice in every source file for your plugin. However, most plugins only place this after the plugin header in the primary plugin file.

<?php /* Copyright (C) <year> <name of author> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */

You need to replace the <year> and <name of author> snippets in that notice with the year the code was created and your name. Once you add the notification to your plugin file(s), it will then be licensed under the GPL.

If working with a client or employer and not distributing the plugin to the public in any way, your plugin may not need a license. Copyright and/or license should be determined by your contract and what you and your client/employer agree to.