Protection against Buffer Overflow

Hi,

Just in order to supplement this thread about Buffer Overflow:
https://www.wilderssecurity.com/showthread.php?t=68353

There is a few softs which protects against Buffer Overfow and threats using these attacks like worms.
If they can increase the line defense, the question could be: are they really necessary?

All these softs work on Windows and in a single computer.

*Overflow Guard (29$) : http://www.datasecuritysoftware.com/index.html


*Stack Defender (49E): http://www.ngsec.com/ngproducts/stackdefender/

*Buffer Shield (free and paid):
http://www.sys-manage.com/sites/I_BuffShld.html

Regards