Hi Anthony,
It really depends on the purpose of the modifications. If you're a hosting company, we have strict rules on editing the templates to reflect your company's colours in a control panel of sorts, then we have a different license, please contact me directly for more details.
However, if you're editing the templates for an internal usage of one company, to allow the people in one organisation to use a more familiar environment, then you're allowed to with the multi-user license.
If you have any concerns, please either Private Message me or send me an email.
Jack.
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Jack Ong, C.O.O.,
Gossamer Threads, Inc.
9th Floor, 100 West Pender, Vancouver, BC, Canada, V6B 1R8
Email: <jack@gossamer-threads.com>
Tel: (604) 687-5804 Fax: (604) 687-5806