Block Distil Networks

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Sites such as www.doctor.com and www.yellowbook.com use their fingerprinting technology.

From their website:
"Only Distil leverages a bot detection methodology that incorporates over 40 bits of information when developing a fingerprint for each user connecting to your website. Delving far deeper than user agents and IP addresses, Distil looks into all connection properties from the first time a user engages your site. Our technology then inserts JavaScript into the connection stream to capture even more detailed characteristics of the user. Once a complete fingerprint is developed and a bot is detected, the bot has no way of escaping our detection ever again."

However looking at their javascript, it's clear that they are no different than the others. Excerpt from de-obfuscated code:

var _0x146bxd = _0x146bx6();
var v_environment = {};
try {
v_environment["appName"] = navigator["appName"];
} catch (e) {
v_environment["appName"] = 0;
};
try {
v_environment["platform"] = navigator["platform"];
} catch (e) {
v_environment["platform"] = 0;
};
try {
v_environment["cookies"] = (navigator["cookieEnabled"]) ? 1 : 0;
} catch (e) {
v_environment["cookies"] = 0;
};
try {
v_environment["syslang"] = (navigator["systemLanguage"]) ? navigator["systemLanguage"] : navigator["language"];
} catch (e) {
v_environment["syslang"] = "";
};
try {
v_environment["userlang"] = (navigator["userLanguage"]) ? navigator["userLanguage"] : navigator["language"];
} catch (e) {
v_environment["userlang"] = "";
};
try {
v_environment["cpu"] = (navigator["oscpu"]) ? navigator["oscpu"] : navigator["cpuClass"];
} catch (e) {
v_environment["cpu"] = "";
};
try {
v_environment["productSub"] = (navigator["productSub"]) ? navigator["productSub"] : 0;
} catch (e) {
v_environment["productSub"] = 0;
};