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:
Oct. 07, 2025
Filed:
Jan. 14, 2021
Ntt, Inc., Tokyo, JP;
NTT, Inc., Tokyo, JP;
Abstract
A communication system includes an information processing device that provides a video conference service; and communication terminals using the service. The information processing device records communication data related to a video conference encrypted and transmitted from each communication terminal in a first storage for the communication terminal; transmits, to the communication terminals, a ciphertext obtained by encrypting an encryption key capable of decoding each item of the communication data recorded in the first storage such that the encryption key can be decoded by the communication terminals; and transmits the communication data recorded in the first storage to the communication terminals. Each communication terminal decodes the communication data for the communication terminal using a decoding result of the ciphertext; and reproduces video and audio included in the communication data decoded for the communication terminal in synchronization with the others based on control data in the communication data.