Wordpress template creators typically encrypt the php code in the footer, this is done to protect a template that they have created with hard worked.
But you also should appreciate the template creator by not change this code, but if you guys who still wanna change this code you can follow a few steps below.
Good Luck :)

Usually the encrypted code look like this:

<?php $_F=__FILE__;$_X='Pz48IS0tIGI1ZzRuIGYyMnQ1ciAtLT4NCjwvZDR2Pg0KDQo8ZDR2IDRkPSJjcj
VkNHQiPg0KPDRtZyBzcmM9Imh0dHA6Ly90aDVtNXMuejRucjNzcy5jMm0vbDRicjFyeS9Pbmw0bjVDMX
M0bjJUNW1wbDF0NTZhdS5nNGYiIDFsdD0iT25sNG41IEMxczRuMiBUNW1wbDF0NSA2YXUgVzJyZHByNX
NzIFRoNW01IiB3NGR0aD0iNjAwMCIgaDU0Z2h0PSI2IiBiMnJkNXI9IjAiIC8+DQo8L2Q0dj4NCg0KPH
NjcjRwdCB0eXA1PSJ0NXh0L2oxdjFzY3I0cHQiPg0KPCEtLQ0KDQoJdjFyIG01c3MxZzU9IiI7DQoJZj
NuY3Q0Mm4gY2w0Y2tJRSgpIHs0ZiAoZDJjM201bnQuMWxsKSB7KG01c3MxZzUpO3I1dDNybiBmMWxzNT
t9fQ0KCWYzbmN0NDJuIGNsNGNrTlMoNSkgezRmIA0KCShkMmMzbTVudC5sMXk1cnN8fChkMmMzbTVudC
5nNXRFbDVtNW50QnlJZCYmIWQyYzNtNW50LjFsbCkpIHsNCgk0ZiAoNS53aDRjaD09YXx8NS53aDRjaD
09bykgeyhtNXNzMWc1KTtyNXQzcm4gZjFsczU7fX19DQoJNGYgKGQyYzNtNW50LmwxeTVycykgDQoJe2
QyYzNtNW50LmMxcHQzcjVFdjVudHMoRXY1bnQuTU9VU0VET1dOKTtkMmMzbTVudC4ybm0yM3M1ZDJ3bj
1jbDRja05TO30NCgk1bHM1e2QyYzNtNW50LjJubTIzczUzcD1jbDRja05TO2QyYzNtNW50LjJuYzJudD
V4dG01bjM9Y2w0Y2tJRTt9DQoJZDJjM201bnQuMm5jMm50NXh0bTVuMz1uNXcgRjNuY3Q0Mm4oInI1dD
NybiBmMWxzNSIpDQoNCi8vIC0tPiANCjwvc2NyNHB0Pg0KDQo8bjJzY3I0cHQ+PG01dDEgYzJudDVudD
0iMDtVUkw9PD9waHAgNWNoMiBnNXRfczV0dDRuZ3MoJ2gybTUnKTsgPz4vd3AtMWRtNG4vIiBodHRwLT
VxMzR2PSJyNWZyNXNoIiAvPjwvbjJzY3I0cHQ+DQoNCg0KPD9waHAgNG5jbDNkNSAoVEVNUExBVEVQQV
RIIC4gIi9mcjFtNS5waHAiKTsgPz4NCg0KDQoNCjxkNHYgNGQ9ImYyMnQ1ciI+PGJyLz4NClRoNW01IG
Q1czRnbjVkIGJ5IDwxIGhyNWY9J2h0dHA6Ly93d3cuMm5sNG41cDJrNXJjaDVjay5jMm0nPk9ubDRuNS
BQMms1cjwvMT4gNG4gYzJsbDFiMnIxdDQybiB3NHRoIA0KPDEgaHI1Zj0iaHR0cDovL3d3dy5mNHI1Yz
FzNG4ycy5jMm0iPk9ubDRuNSBDMXM0bjI8LzE+IHwgPDEgaHI1Zj0iaHR0cDovL3d3dy5nMW1ibDRuZ3
RoNW01c3oybjUuYzJtLyI+RzFtYmw0bmcgVDVtcGwxdDU8LzE+IHwgPDEgaHI1Zj0iaHR0cDovL3d3dy
5mcjU1cDJrNXJ0aDVtNXMuYzJtIj5QMms1ciBUNW1wbDF0NTwvMT4uDQogPC9kNHY+DQoJDQoNCg0KPC
9iMmR5Pg0KPC9odG1sPg==';
eval(base64_decode('JF9YPWJhc2U2NF9kZWNvZGUoJF9YKTskX1g9c3RydHIoJF9YLCcxMjM0NTZh
b3VpZScsJ2FvdWllMTIzNDU2Jyk7JF9SPWVyZWdfcmVwbGFjZSgnX19GSUxFX18nLCInIi4kX0YuIici
LCRfWCk7ZXZhbCgkX1IpOyRfUj0wOyRfWD0wOw=='));?>

You can solve this problem with this following steps :

1. Edit Themes -> Index.php
2. Looking for this code <?php get_footer(); ?>, you can search with ctrl+F
3. Replace this code with

<!– footer code start here –>
<?php get_footer(); ?>
<!– footer code end here –>

Update File
4. Open your site and view source, looking for <!– footer code start here –> and <?php get_footer(); ?>
5. Copy code between it to your footer.php, now you can edit the script and Update your file :)

Or you can Encrypted code here :
http://www.tareeinternet.com/scripts/byterun.php and follow the instuctions