Remove Joomla SEO powered by JoomSEF

How remove “Joomla SEO powered by JoomSEF” bottom link?
open with a file editor components/com_sef/joomsef.php

Find this lines: 2429-2439

$cacheBuf2 =
‘PGRpdj48YSBocmVmPSJodHRwOi8vd3?.
‘d3LmFydGlvLm5ldC9qb29tbGEtZXh0?.
‘ZW5zaW9ucy9qb29tc2VmIiBzdHlsZT’.
’0iZm9udC1zaXplOiA4cHg7IHZpc2li’.
‘aWxpdHk6IHZpc2libGU7IGRpc3BsYX’.
‘k6IGlubGluZTsiIHRpdGxlPSJKb29t’.
‘U0VGOiBKb29tbGEgU0VPIGNvbXBvbm’.
‘VudCBmb3IgU0VGIFVSTHMiPkpvb21s’.
‘YSBTRU8gcG93ZXJlZCBieSBKb29tU0?.
‘VGPC9hPjwvZGl2Pg==’;

and replace with:

//$cacheBuf2 =
//’PGRpdj48YSBocmVmPSJodHRwOi8vd3?.
//’d3LmFydGlvLm5ldC9qb29tbGEtZXh0?.
//’ZW5zaW9ucy9qb29tc2VmIiBzdHlsZT’.
//’0iZm9udC1zaXplOiA4cHg7IHZpc2li’.
//’aWxpdHk6IHZpc2libGU7IGRpc3BsYX’.
//’k6IGlubGluZTsiIHRpdGxlPSJKb29t’.
//’U0VGOiBKb29tbGEgU0VPIGNvbXBvbm’.
//’VudCBmb3IgU0VGIFVSTHMiPkpvb21s’.
//’YSBTRU8gcG93ZXJlZCBieSBKb29tU0?.
//’VGPC9hPjwvZGl2Pg==’;

tested on nwest Version: 3.8.1