[License-discuss] Copyright holders evolution with MIT license

[Aurélien Thierry]

Hello,
I have a question regarding the copyright holders of a software under the
MIT license.

My case is this one :
- Some software was developped under the MIT license in Company1 in 2014
- The software is now (2015) developped by Company2 and will be released
under the same MIT license

The initial copyright clause is :
"Copyright (c) 2014 Company1"

What should it be in the new release ? Should it include the previous
statement as follows:
"Copyright (c) 2015 Company2
Copyright (c) 2014 Company1"
?

I guess there should be a way to keep track of copyright holders ("The
above copyright notice [...] shall be included in all copies or substantial
portions of the Software.") but I'm not sure how.


Thank you for your attention,
Aurelien
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