An open license or free license is a license that allows others to re-use an author's work as they wish. Without such a license, such use is generally prohibited by copyright law or a closed license.
Licenses
By type of license
Public domain licenses
Creative Commons CC0
WTFPL
Unlicense
Public Domain Dedication and License (PDDL) Permissive licenses BSD License MIT License Mozilla Public License (file-based permissive copyleft) Creative Commons Attribution Copyleft & patentleft licenses GNU GPL, LGPL (weaker copyleft), AGPL (stronger copyleft) Creative Commons Attribution Share-Alike Mozilla Public License Common Development and Distribution License GFDL (without invariant sections) Free Art License
By type of content
Open-source software
The Open Source Definition
Open Content
Open Content License
Open Publication License
Open-source hardware
Open database
Creative Commons v4
Open Database Licence
By authors
Creative Commons
Free Software Foundation
Open Source Initiative
Microsoft
Microsoft Public License
Microsoft Reciprocal License
Open Content Project
Open Data Commons from Open Knowledge Foundation
Public Domain Dedication and License (PDDL) Attribution License (ODC-By) Open Database License (ODC-ODbL) European Union European Union Public Licence