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Generally, browsing indexed GDC metadata (such as information about the cases and files contained in the GDC Data Portal) does not require a login.
eRA Commons authentication and dbGaP authorization are required before accessing controlled data, which generally includes individually identifiable information such as low level genomic sequencing data and germline variants.
Controlled-access data users log in to the GDC using their eRA Commons accounts. The GDC then verifies that the user has authorization in dbGaP to access specific controlled datasets.
See Obtaining Access to GDC Data and Resources for more information on data download, and Obtaining Access to Submit Data for information on data submission.
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