The only way to apply limitations to what a user of the board can accomplish would be through Business Class and adding users to the board as observers. Observers are limited to view the board, and you can enable commenting/voting if you prefer. They won't be able to do anything else like add information to a card, however.
You’re invited to our first ever Trello User Groups Good news for current and aspiring Trello enthusiasts! We’re launching Trello User Groups so that you can network, share ideas, solve ...
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