Licenses
The iframe-resizer library it is available with either a Commercial License, or an Open Source License.
Commercial License
If you want to use iframe-resizer on non open-sourced sites, themes, projects, and/or applications, the Commercial License is the appropriate license. With this option, your source code is kept proprietary. Which means, you won’t have to change your whole application source code to an open source license.
Purchase License Read License
Open-Source License
If you are creating an open source project under a license compatible with the GNU General Public License version 3 (GPL v3), then you may use iframe-resizer under the terms of the GPL v3 license.
You will have to provide a prominent notice that iframe-resizer is in use. The credit comments in the JavaScript files should be kept intact (even after combination or minification).
Use Open Source License