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license= 

        # Gem::Specification.license=

(from ruby core)
### Implementation from Specification
---
    license=(o)

---

The license for this gem.

The license must be no more than 64 characters.

This should just be the name of your license. The full text of the
license should be inside of the gem (at the top level) when you build
it.

The simplest way is to specify the standard SPDX ID
https://spdx.org/licenses/ for the license. Ideally, you should pick one
that is OSI (Open Source Initiative)
http://opensource.org/licenses/alphabetical approved.

The most commonly used OSI-approved licenses are MIT and Apache-2.0.
GitHub also provides a license picker at http://choosealicense.com/.

You can also use a custom license file along with your gemspec and
specify a LicenseRef-<idstring>, where idstring is the name of the file
containing the license text.

You should specify a license for your gem so that people know how they
are permitted to use it and any restrictions you're placing on it.  Not
specifying a license means all rights are reserved; others have no right
to use the code for any purpose.

You can set multiple licenses with #licenses=

Usage:
    spec.license = 'MIT'

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