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stsadm -o setformsserviceproperty -pn AllowBranding -pv false

stsadm -o setformsserviceproperty -pn AllowBranding -pv true

and other method is goto following location "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\TEMPLATE\LAYOUTS\INC" and open the following CSS "ifsmain.css" and goto last of CSS

.BrandingText
{
border-top:1px solid #666666; padding-top:5px; padding-bottom:0px; padding-left:1px; padding-right:1px; text-decoration:none;
font-family:Tahoma;
font-size:8pt;
margin-top:0px; color:#666666;
}
.ToolbarBranding
{
text-decoration:none;color:#666666; white-space:nowrap;unicode-bidi:embed;cursor:default;
font-family:tahoma;
font-size:8pt;
}


Replace above with following

.BrandingText
{
border-top:1px solid #666666; padding-top:5px; padding-bottom:0px; padding- left:1px; padding-right:1px; text-decoration:none;
font-family:Tahoma;
font-size:8pt;
margin-top:0px; color:#666666;
display:none;
}

.ToolbarBranding
{
text-decoration:none;color:#666666; white-space:nowrap;unicode-bidi:embed;cursor:default;
font-family:tahoma;
font-size:8pt;
display:none;
}