Question about the copyright

[Khoi (Khoi Nguyen)]

Hi,

I’m wondering it’s legal or not if I copy source code from Vaadin’s repository and modify them for commercial use. Do I have to keep the license notice at the beginning of each source file or not?

Please help!

Many Thanks,
Khoi

[Joonas (Joonas Lehtinen)]

Yes, you can modify code for commercial use, but you have to follow licenses. There are lots of code in our repository - not just the core framework (which is licensed under Apache), but also other components with various licenses. In any case, you have to follow the license.

Yes, you have to keep the license notice. For the core framework, see the
Apache license
:

4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions:

You must give any other recipients of the Work or Derivative Works a copy of this License; and

You must cause any modified files to carry prominent notices stating that You changed the files; and

You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and

If the Work includes a “NOTICE” text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License.
You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License.

[Khoi (Khoi Nguyen)]

Hi Joonas,

Thank you for your answer. I’ve got it

Khoi