Abstract: A first metal sheet is placed on a backing metal plate, and an end portion of a second metal sheet is placed on top of an end portion of the first metal sheet such that the ends of the end portions are spaced apart from each other by a predetermined distance in side view. The end portions of the first and second metal sheets are joined together by downwardly pressing a rotating rotary tool onto the end portion of the second metal sheet placed on top of the end portion of the first metal sheet and by utilizing frictional heat and pressurizing force generated between the rotating tool and the first and second metal sheets.

Abstract: One or more techniques and/or systems are provided for securely authorizing a client to consume data and/or services from a service provider server while mitigating burdensome requests made to a validation server. That is, validation data provided to a client from a validation server may be maintained on the client and at least some of that validation data can be used to subsequently authorize the client when the client attempts to consume data and/or services from the service provider server (e.g., download a song). However, the validation data is maintained on the client and/or provided to the service provider server in a manner that inhibits user tampering. In this manner, numerous requests for validation of the client need not be made from the service provider server to the validation server when a client requests content from the service provider server, while also inhibiting unauthorized consumptions of data by the client.

Abstract: One or more techniques and/or systems are provided for securely authorizing a client to consume data and/or services from a service provider server while mitigating burdensome requests made to a validation server. That is, validation data provided to a client from a validation server may be maintained on the client and at least some of that validation data can be used to subsequently authorize the client when the client attempts to consume data and/or services from the service provider server (e.g., download a song). However, the validation data is maintained on the client and/or provided to the service provider server in a manner that inhibits user tampering. In this manner, numerous requests for validation of the client need not be made from the service provider server to the validation server when a client requests content from the service provider server, while also inhibiting unauthorized consumptions of data by the client.