Hopefully you agree that there are benefits to libre. How do you actually ‘go libre’?
Everyone can make a conscious choice to use libre stuff over proprietary stuff whenever they get the chance. A lot of libre stuff is gratis (free of charge), so it won’t cost you anything to use. You can see a collection of libre, semi-libre and pseudo-libre works over at the FOSsil Bank, a wiki I set up.
But if you’ve created something, then you can contribute by making your own work libre.
How to Make a Work Libre
If you hold the copyright over a work, making it libre is as simple as applying a libre licence to it.
Exactly how to do this varies by licence. Creative Commons has two libre licences, Creative Commons Attribution and Creative Commons Attribution-ShareAlike. If you visit their website and choose a licence, they explain how to license your work under that licence. If your work is offline, it’s as simple as copy-pasting something like this into your work:
This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.
If you’re interested in applying the Open Game License, I suggest reading through my 1-page guide.