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Clean-Box can block your spam.

Allows you to block unauthorized USB devices from any PC or your entire network.

A RAM disk is a block of RAM that a computer treats as a local Hard Disk Drive.

Full control over Internet usage on the computer, block and filter out websites

This is a simple python implementation of the XTEA block encryption algorithm

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click4choice is a great toolbar to search web and block pop ups.

Technique to build flexible CSS drop shadows applied to arbitrary block elements

This unique and intuitive application allows you to block junk mail (spam)

libdvdcss is a simple library designed for accessing DVDs like a block device.