Unable to change vancouver style

Hi,
I am trying to edit the Vancouver style (superscript, only year in date, no issue number).
My modified style is linked here
https://gist.github.com/4032327
I have tried validating it with csl-validator.js without any problems. however validation with validator.nu shows error with the "rights" line.
I am unable to get this style accepted by zotero which says not a valid csl file error.

Kindly help.
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