Code ported from one to another language - licensing
I ported some code from C to C# and I also added some new features into the ported code. Original code is under MPL license. 

This is original source code license terms:

    /*
     * file name
     * Version .....
     *
     * Copyright (c) 2004-2012 by XXX YYY
     *
     * The contents of this file are subject to the Mozilla Public License Version
     * 1.1 (the "License"); you may not use this file except in compliance with
     * the License. You may obtain a copy of the License at
     * http://www.mozilla.org/MPL/
     *
     * Software distributed under the License is distributed on an "AS IS" basis,
     * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
     * for the specific language governing rights and limitations under the
     * License.
     *
     * The Original Code is file.c
     *
     * The Initial Developer of the Original Code is XXX YYY.
     *
     * Portions created by XXX YYY are Copyright (C) 2004-2012
     * XXX YYY. All Rights Reserved.
     *
     */

**Can i change the license for the ported code and include original source code license terms of the original source code this way:**

    //
    // test.cs
    //
    // Author:
    //   "My Name" (my@email.com) 
    //
    // Copyright (c) 2012 My Name
    //
    // Permission is hereby granted, free of charge, to any person obtaining
    // a copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to
    // permit persons to whom the Software is furnished to do so, subject to
    // the following conditions:
    //
    // The above copyright notice and this permission notice shall be
    // included in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
    // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    // 
    // Parts of this source code are ported from C to C# by "My Name".
    //
    // The Original Code is file.c (http://original-source-code-link.com);
    // and under Mozilla Public License Version 1.1 (http://www.mozilla.org/MPL/) 
    // The Initial Developer of the Original Code is XXX YYY (xxxyyy@email.com).
     
Code ported from one to another language - licensing
===

I ported some code from C to C# and I also added some new features into the ported code. Original code is under MPL license. 

This is original source code license terms:

    /*
     * file name
     * Version .....
     *
     * Copyright (c) 2004-2012 by XXX YYY
     *
     * The contents of this file are subject to the Mozilla Public License Version
     * 1.1 (the "License"); you may not use this file except in compliance with
     * the License. You may obtain a copy of the License at
     * http://www.mozilla.org/MPL/
     *
     * Software distributed under the License is distributed on an "AS IS" basis,
     * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
     * for the specific language governing rights and limitations under the
     * License.
     *
     * The Original Code is file.c
     *
     * The Initial Developer of the Original Code is XXX YYY.
     *
     * Portions created by XXX YYY are Copyright (C) 2004-2012
     * XXX YYY. All Rights Reserved.
     *
     */

**Can i change the license for the ported code and include original source code license terms of the original source code this way:**

    //
    // test.cs
    //
    // Author:
    //   "My Name" (my@email.com) 
    //
    // Copyright (c) 2012 My Name
    //
    // Permission is hereby granted, free of charge, to any person obtaining
    // a copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to
    // permit persons to whom the Software is furnished to do so, subject to
    // the following conditions:
    //
    // The above copyright notice and this permission notice shall be
    // included in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
    // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    // 
    // Parts of this source code are ported from C to C# by "My Name".
    //
    // The Original Code is file.c (http://original-source-code-link.com);
    // and under Mozilla Public License Version 1.1 (http://www.mozilla.org/MPL/) 
    // The Initial Developer of the Original Code is XXX YYY (xxxyyy@email.com).
     