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:
Jul. 26, 2011
Filed:
Oct. 06, 2004
Hee-chul Han, Suwon-si, KR;
Yun-sang Kim, Suwon-si, KR;
Yang-lim Choi, Seongnam-si, KR;
Sung-hyu Han, Seoul, KR;
Yong-kuk You, Seoul, KR;
Hee-chul Han, Suwon-si, KR;
Yun-sang Kim, Suwon-si, KR;
Yang-lim Choi, Seongnam-si, KR;
Sung-hyu Han, Seoul, KR;
Yong-kuk You, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
A method of and an apparatus for copying and decrypting encrypted digital data. The method of copying encrypted digital data includes encrypting a first media key block to be used for decryption of the encrypted digital data using a predetermined key of a second information storage medium and storing the encrypted digital data and the encrypted first media key block in the second information storage medium. Security of data encryption is heightened by not discarding an encryption key used for an initial encryption, encrypting the encryption key used for initial encryption using another encryption key used for a second encryption, and storing the encrypted encryption key with the data. Also, since unnecessary decryption and encryption of data are not repeated, the time required for copying data is reduced, and since data is transferred between apparatuses in an encrypted state, a security level is higher.