Suppose I fork a software with 1000 files licensed under the MIT License.
There's only a
LICENSE file in the root of the project (no MIT License notice at the beginning of the files).
Now, if I add other 1000 files and want to relicense the whole software under another License, how can I keep the proper attribution?
Should I create an MIT License snippet, fill it with the original author's name, and paste on top of each one of the original thousand of files? Or what?
And what if, instead of adding a brand new file, I modify one of the original ones? Should I put the old license notice, the new license notice, both the license notices and the name of both authors?