よくWebOSやJSで禁止されるキー設定 ref: http://qiita.com/songfei1983/items/f8d5fde5709c74c6b5f5

file0.js

var event = e || window.event;
var k = event.keyCode;
if((event.ctrlKey == true && k == 82) || (event.ctrlKey == true && k == 78) || (k == 116) || (event.ctrlKey == true && k == 116))
{
    event.keyCode = 0;
    event.returnValue = false;
    event.cancelBubble = true;
    return false;
}

file1.js

document.oncontextmenu = function(){
    return false;
};

file2.js

document.ondragstart = function(){
    return false;
};

file3.js

document.onselectstart = function( e ){
    var event = e || window.event;
    var tagName = '';
    try{
        tagName = (event.target || event.srcElement).tagName.toLowerCase();
    }
    catch(e){}
    if( tagName != 'textarea' && tagName != 'input'){
        return false;
    }
}

file4.js

document.onclick = function( e ){
    //Shift + click 及び Ctrl + click を禁止

    var event = e || window.event;

    var tagName = '';
    try{
        tagName = (event.target || event.srcElement).tagName.toLowerCase();
    }
    catch(e){}

    if( (event.shiftKey || event.ctrlKey) && tagName == 'a' ){
        event.keyCode = 0;
        event.returnValue = false;
        event.cancelBubble = true;
        return false;
    }
}