Elastic License 2.0
Free except for hosting it as a service for others; terms never change.
License text
Elastic License 2.0 (ELv2)
Copyright Legal name of the copyright holder
Software: Name of the software being licensed
Acceptance
By using the software, you agree to all of the terms and conditions below.
Copyright License
The licensor grants you a non-exclusive, royalty-free, worldwide,
non-sublicensable, non-transferable license to use, copy, distribute, make
available, and prepare derivative works of the software, in each case
subject to the limitations below.
Limitations
You may not provide the software to third parties as a hosted or managed
service, where the service provides users with access to any substantial
set of the features or functionality of the software.
You may not move, change, disable, or circumvent the license key
functionality in the software, and you may not remove or obscure any
functionality in the software that is protected by the license key.
You may not alter, remove, or obscure any licensing, copyright, or other
notices of the licensor in the software.
Patents
The licensor grants you a license, under any patent claims the licensor can
license, or becomes able to license, to make, have made, use, sell, offer
for sale, import and have imported the software, in each case subject to the
limitations and conditions in this license.
Notices
You must ensure that anyone who gets a copy of any part of the software from
you also gets a copy of these terms.
If you modify the software, you must include in any modified copies a
prominent notice stating that you have modified the software.
No Other Rights
These terms do not imply any licenses other than those expressly granted in
these terms.
Termination
If you use the software in violation of these terms, such use is not
licensed, and your licenses will automatically terminate. If the licensor
provides you with a notice of your violation, and you cease all violation of
this license no later than 30 days after you receive that notice, your
licenses will be reinstated retroactively.
No Liability
AS FAR AS THE LAW ALLOWS, THE SOFTWARE COMES AS IS, WITHOUT ANY WARRANTY OR
CONDITION, AND THE LICENSOR WILL NOT BE LIABLE TO YOU FOR ANY DAMAGES ARISING
OUT OF THESE TERMS OR THE USE OR NATURE OF THE SOFTWARE, UNDER ANY KIND OF
LEGAL CLAIM.