No license specified, it is recommended to do so. For closed-source software you may use "proprietary" as license?

Question

Yii

[email protected]:/var/www/_# composer diag
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Checking composer.json: FAIL
No license specified, it is recommended to do so. For closed-source software you may use "proprietary" as license.
require.yiisoft/yii2 : unbound version constraints (>=2.0.9) should be avoided
require.bower-asset/jquery : unbound version constraints (>=3.0.0) should be avoided
require.yiisoft/yii2-bootstrap : unbound version constraints (>[email protected]) should be avoided
require.bower-asset/bootstrap : unbound version constraints (>[email protected]) should be avoided
require.bower-asset/font-awesome : unbound version constraints (*) should be avoided
require.yiisoft/yii2-authclient : unbound version constraints (*) should be avoided
require.yiisoft/yii2-swiftmailer : unbound version constraints (*) should be avoided

Suddenly out of the blue an error. What could it be?

Answer 1

well, I think it makes no sense to write about root .. :) about the rest:
- no license is specified in composer.json https://getcomposer.org/doc/04-schema.md#license
- version definition in the form * >= etc. is not recommended due to a number of possible fails https://getcomposer.org/doc/faqs/why-are-unbound-v...