What is considered to be a "modification" of sources under the BSD license?

Posted by Den on Programmers See other posts from Programmers or by Den
Published on 2014-08-20T20:42:44Z Indexed on 2014/08/20 22:32 UTC
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I have a question about the 3-clause BSD license based on it's Wiki description.

It states:

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: ...

What is understood by "modification"? Specifically I am interested whether any/all of the following is considered as such modification:

1) reading the original sources and then re-implementing;

2) reading the original sources, waiting for a year and then re-implementing something based on whatever you could remember;

3) direct and very significant "complete" refactoring of the original sources.

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