Question

If my site uses jquery and jquery plugins, am I supposed to refer to the MIT license and give credit to the creators? Ordoes this only apply to software redistribution?

Answer 1

The MIT license linked to by the jQuery Web site:

Copyright (c) 2010 John Resig,
http://jquery.com/

Permission is hereby granted, free of
charge, to any person obtaining a copy
of this software and associated
documentation files (the “Software”),
to deal in the Software without
restriction, including without
limitation the rights to use, copy,
modify, merge, publish, distribute,
sublicense, and/or sell copies of the
Software, and to permit persons to
whom the Software is furnished to do
so, subject to the following
conditions:

The above copyright notice and this
permission notice shall be included in
all copies or substantial portions of
the Software.

THE SOFTWARE IS PROVIDED “AS IS”,
WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.

I’d say this is pretty self-explanatory. If you distribute substantial portions of the software, the copyright notice must be included.

EDIT:

Upon reading your question again, maybe you’re wondering if you have to display the notice on your Web pages somewhere. In that case I would say no, the notice in the scripts themselves is enough. Just don’t delete them.