Here’s how to remove the ‘Joomla SEF URLs by artio’ link that comes with the free version of JoomSEF 4.1.0.
Open up com_sef/joomsef.php and somewhere in code you’ll see something similar to:
$cacheBuf2 = 'PGRpdj48YSBocmVmPSJodHRwOi8vd3'. 'd3LmFydGlvLm5ldCIgc3R5bGU9ImZv'. 'bnQtc2l6ZTogOHB4OyB2aXNpYmlsaX'. 'R5OiB2aXNpYmxlOyBkaXNwbGF5OiBp'. 'bmxpbmU7IiB0aXRsZT0iV2ViIGRldm'. 'Vsb3BtZW50LCBKb29tbGEsIENNUywg'. 'Q1JNLCBPbmxpbmUgc2hvcCBzb2Z0d2'. 'FyZSwgZGF0YWJhc2VzIj5Kb29tbGEg'. 'U0VGIFVSTHMgYnkgQXJ0aW88L2E+PC'. '9kaXY+';
You’ll simply need to replace all of that with this:
$cacheBuf2 = '';