Hi,
Congrats you decided for a good one. Here i may be giving you suggestion regarding your question.
1. you need to decide whether the contact details include all personal details of a company resource in sense of the directors residential address, email, phone and etc.
In this regard, if your answer is yes, You must ask them for a permission to display all details of them.
if you are going to display only their company details, its fine. but in my view, asking permission is better even though its their company details.
And I suggest one more thing that to protect your site from hackers and malicious software attack. To prevent from those attacks you must protect your site with the protection scanner which is available at the service providers like
http://www.thewebpole.com/. If my informations worth to you please extend your comments