WEP key differences

[studentsupport]

Hello,
I got a question regarding converting ASCII to WEP key.
The first way is simply converting ASCII to HEX:
UBUNTU - 75:62:75:6E:74:75
Another is making of a 64 bit WEP key of any length of ASCII expression:
UBUNTU - E69959C009
reference: http://www.wepkey.com/

The question itself: why there is several ways of converting ASCII to WEP? Could anyone explain the second way of conversion and if it is one-way or E69959C009 key could be recursively converted to UBUNTU?
Thank you

[hyper_ch]

if you want security you do not want to use WEP. This can be cracked in a matter of minutes. Go for WPA or WPA2

[studentsupport]

if you want security you do not want to use WEP. This can be cracked in a matter of minutes. Go for WPA or WPA2

I know its not secure, I am just interested in the ways of conversion.