Remove 'rights' from EC first paragraph.

Regrettable, but it doesn't hold anyway I think, and it sounds odd.

Signed-off-by: Engel Nyst <engel.nyst@gmail.com>
Adapt somewhat Contribution and Contributor definitions.

Not sure why it's 'received work' instead of 'work'.

Signed-off-by: Engel Nyst <engel.nyst@gmail.com>
Adapt language of No Further Restrictions for CC free licenses.

Signed-off-by: Engel Nyst <engel.nyst@gmail.com>
Adapt language of certification in the clause formerly known as EC.

Signed-off-by: Engel Nyst <engel.nyst@gmail.com>
Formatting.

Signed-off-by: Engel Nyst <engel.nyst@gmail.com>
Add cure period to Proprietary Relicensing.

This is probably a can of worms, and may cancel the intention of the clause...
The purpose of the addition is to give some way out to mistakes, in particular
for single-author/few-authors upstream, work-in-progress in repositories,
snippets of copy-pasted code where they dont pay attention to license.

One issue that appears here, is the licenses which conform to OSD/FS, but for
a reason or another are not OSI certified nor acknowledged as FS. It's insoluble
IMO, other than by sacrificing simplicity too much, but, a cure period may help
some of these cases.
I expect them to be much more downstream actually (but that's violation of the
license not PR).

Signed-off-by: Engel Nyst <engel.nyst@gmail.com>