Obviousness

I cannot perform an obviousness analysis of US Patent 9,251,531 under 35 U.S.C. § 103 based solely on the provided patent text.

The provided patent information on the Google Patents page for US9251531B2 lists "Prior art keywords" (credential, user, over file, over, stored) and a "Prior art date" (2012-12-21). However, it does not explicitly list specific prior art references (e.g., other patent numbers, publications, or non-patent literature) that were cited against the patent or that would be used in an obviousness analysis. The "CROSS-REFERENCE TO RELATED APPLICATION" section mentions U.S. provisional patent application No. 61/740,731, filed December 21, 2012, which serves as a priority document for US9251531, not as prior art against it.

Without a list of specific prior art documents, it is not possible to "Identify combinations of prior art references that would render the claims obvious, and explain why a person having ordinary skill in the art would have been motivated to combine them," as requested.