Rights Object Transfer Encryption Prevents Copying
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Solution Overview
Problem
Existing methods for transferring a Rights Object (RO) between devices often result in the RO being copied if the transfer process is terminated abnormally, leading to its presence in both devices.
Innovation Solution
A method involving the encryption of the RO using an encryption module, which generates a secure RO and transfers it to another device, ensuring the RO is only present in one device after successful transfer, utilizing a control module to manage the encryption and decryption process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RO transfer process is terminated abnormally between transfer initiation and completion notification, then the transfer process is interrupted, but the RO remains in both the host device and portable storage device causing unauthorized copying
Solution Approach 1:
The patent applies preliminary action by encrypting the RO with a unique device identifier before transfer begins. This encryption is performed in advance so that even if transfer is interrupted, the RO cannot be used without the corresponding decryption key stored only in the original host device. The encryption preparation happens before the transfer process starts, ensuring security is established beforehand.
Solution Approach 2:
The patent changes the state parameter of the RO from plaintext to encrypted form during the transfer process. The RO is transformed using cryptographic functions with device-specific keys, changing its accessibility parameters. This parameter transformation ensures that the RO cannot be executed or copied in unauthorized devices, as it exists in an encrypted state that only the target device can decrypt.
2Reliability
If the RO is encrypted using the encrypting means before transfer, then security during transfer is improved, but additional encryption/decryption processing time is required
Solution Approach 1:
The encryption operation is performed as a preliminary step before the actual RO transfer begins. By preparing the encrypted RO in advance and storing it ready for transfer, the system avoids the need to perform encryption during the critical transfer window, reducing the time the RO is vulnerable and minimizing processing delays during the transfer operation itself.
Data Source
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AI summary
A method of transferring a rights object (RO) and an electronic device are provided. The method includes generating a secure RO by encrypting an RO including usage rights information regarding digital content and transferring the secure RO from a first device to a second device.