How to block uploading to the internet?

    Our's is a small software company. We want to block data uploading to the internet from staff computers. We use windows XP , Kaspersky 2011 as antivirus.

How can I block uploading to internet?
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-HenryM-Connect With a Mentor Commented:
then your best bet would be to install a proxy and deny all xp workstations on the company network direct access to the internet... you'll have to evaluate which proxy best suits your needs - (blocking uploads, etc)

but here's the best place to start:
Ian MeredithCommented:
It's not impossible but your better off disconnecting from the internet....

There are many ways that files can be uploaded:
1. Upload to certain websites, eg: webmail, file sharing websites...
2. Using msn/yahoo/icq messengers to send files.
3. Email attachments.
4. FTP
5. Other third party tools.

I would recommend researching firewall software that can be customised and rolled out to all PCs.
Climbing Everest is not technically impossible either, it has been done, but not by me or you.

Seriously, if you can't just pull the plug then you're going to need to have a talk with your people about acceptable internet use. Its a small company so do it in person. Explain your policy and be respectful, not accusatory. You don’t have to explain your reasons but it might help. If your people won’t respect your wishes then replace them … or re-evaluate the necessity of this rule.

Consider this: the NSA cannot tolerate its employees uploading files.  It is a matter of national security. They have a hammer that you don't... employees who break their rules can be sent to prison!  Nonetheless, they solve the issue of needing internet access without uploads in a very practical manner... two networks.  Employees who need internet access have two computers on their desk, one is connected to the internet and the other is connected to the LAN and neither of them have disk drive etc…  to transfer data between them.

I am not suggesting that you do this, just illustrating the futility of blocking all uploads.  Even with tons of computer expertise (or perhaps because of it) the NSA doesn’t do what you’ve suggested.
do you know the sites you want to block? do you have a domain controller? (sbs perhaps?)
gloierAuthor Commented:
No, I want to block uploading to any website.
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