[NTLUG:Discuss] iso md5sum question

[Fred James]

All
I downloaded ubcd411.zip, unzip'd it to ubcd411.iso and ran md5sum 
against it ...
    md5sum ubcd411.iso returned a number identical to the one posted on 
the web site
    md4sum --check ubcd411.iso returned this message ...
"md5sum: ubcd411.iso: no properly formatted MD5 checksum lines found"

What am I looking at?  Thank you in advance for any help you may be able 
to offer
Regards
Fred James