本产品质量证明书盖章有效，复印无效的翻译：The product quality certification seal is valid, copying is not valid 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Effectively seal the product quality certificate, copy invalid

The product quality certification seal is valid, copying is not valid

This product quality certificate stamps effectively, the photocopying is invalid

The quality of the products effectively sealed, photocopying invalid certificate

The product quality certification seal is valid, copying is not valid