The copyright in all drawings, documents, and other materials containing data and information furnished to the Purchaser by the Supplier herein shall remain vested in the Supplier, or, if they are furnished to the Purchaser directly or through the Supplier by any third party, including suppliers of materials, the copyright in such materials shall remain vested in such third party.

绘图、文献和其它包含有数据同信息的版权在被供应方转给购买方时，版权仍应归属于供应方。或者，如果，版权已被直接或间接从任何第三方通过供应方转给购买方，包括材料的供应方，这些材料的版权仍应归属上述第三方。（我对这方面不懂，只是从字面给你翻译，不知道对不对。