4.3 Certain Limitations on Use of Products. Purchaser acknowledges that each Product has incorporated therein significant proprietary information and rights of CHEM. Without CHEM’s prior written permission, Purchaser will not, directly or indirectly: (a) reverse engineer, decompile, or disassemble any part of the Products; (b) modify, translate, or create derivative works based on any part of the Products; (c) rent, lease, distribute, sell, resell, assign, or otherwise transfer rights to the Software; (d) use the Software for timesharing or service bureau purposes or otherwise for the benefit of a third party; or (e) remove any proprietary notices or labels on the Products. Because the Products are proprietary, Purchaser agrees not to publish or disclose to third parties any evaluation of any part of the Products without CHEM’s prior written consent.