Employee shall assign and does hereby assign to the Key Companies, the entire right, title and interest (including, but not limited to, rights to prepare derivative works, adaptations and modifications) for the entire world in and to all work performed, writings, formulas, designs, models, drawings, recordings, photographs, design inventions and other inventions whether or not patentable, patents, copyrights, trade secrets, any other intellectual property rights, products, technology, and other proprietary rights made, conceived or reduced to practice or authorized by the Key Companies, either solely or jointly with others pursuant to or in connection with services rendered under this Agreement or with use of information, materials or facilities of the Key Companies received or used by Employee during the term of this Agreement. Employee agrees to sign, execute and acknowledge or cause to be signed, executed and acknowledged without cost, but at the expense of the Company, any and all documents and to perform such acts as may be necessary, useful or convenient for the purpose of securing to the Company, or its nominees, patent, trademark or copyright protection throughout the world upon all such writings, formulas, designs, models, drawings, recordings, photographs, and inventions, whether or not patentable, patents, copyrights, trade secrets, any other intellectual property rights, products, technology, and other proprietary rights, title to which the Company may acquire in accordance with the provisions of this clause. Employee shall not contest the validity of any invention, any copyright, any trademark, or any mask work registration owned by or vesting in the Key Companies under this Agreement.