Abstract: A photo resist layer is used to protect a dielectric layer and conductive elements embedded in the dielectric layer when patterning an etch stop layer underlying the dielectric layer. The photo resist layer may further be used to etch another dielectric layer underlying the etch stop layer, where etching the next dielectric layer exposes a contact, such as a gate contact. The bottom layer can be used to protect the conductive elements embedded in the dielectric layer from a wet etchant used to etch the etch stop layer.

Abstract: A data transmission system includes a plurality of electronic devices, an verification server, and at least one access server. The electronic devices are verified by the verification server, and a data transmission group formed by the verified electronic devices. A receiving end in the data transmission group sends a command to the rest of the electronic devices in the data transmission group by the verification server. When the rest of the electronic devices receive the command, the rest of the electronic devices output metadata to the access server. The receiving end receives the metadata via the access server. The receiving end requests the transmitting end in the data transmission group for a physical file according to the metadata. The transmitting end transmits the physical file to the access server, and the access server transmits the physical file to the receiving end.