The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 2023
Filed:
Oct. 15, 2020
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Jagannathdas Rath, Bengaluru, IN;
Kalyan C Gunda, Bangalore, IN;
Rekha Sampath, Saratoga, CA (US);
Satish Inampudi, Sunnyvale, CA (US);
Senthil Ponnuswamy, San Jose, CA (US);
Sophie Syau Fang Deng, Saratoga, CA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
A system clock is protected by limiting clock changes, change frequency, and calculating skew. System and secure clocks are initialized to a same time. First and second thresholds are set. The first threshold corresponds to an alert and the second threshold corresponds to an action. At a time interval at which the secure clock is to be updated, a skew is calculated between the system and secure clocks, and a cumulative skew is calculated. Upon a determination that the cumulative skew has reached the first threshold, but not the second threshold, the alert is triggered while deletions of files having retention locks that have expired according to the system clock are allowed to continue. Upon a determination that the cumulative skew has reached the second threshold, the action is triggered. The action includes blocking the deletions of files having retention locks that have expired according to the system clock.