IMS Gateway Secure Remote DRM Content Access
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Solution Overview
Problem
Conventional digital rights management (DRM) systems in IMS-based networks restrict content access to authorized devices within close proximity, limiting remote access to protected content within home networks due to security concerns and lack of proper infrastructure for unauthorized access.
Innovation Solution
A framework that enables secure remote access to protected IP-based content over IMS-based IPTV networks by using a Service Control application to authorize access based on DRM rights, subscription rights, device capabilities, and location, allowing portable devices to access content stored in home networks via a home network gateway and key exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DRM systems restrict content access to devices within close proximity, then content protection from unauthorized access is improved, but remote access capability deteriorates
Solution Approach 1:
The patent introduces a gateway device as an intermediary between the home network and external networks. The gateway maintains DRM protection by verifying device credentials and managing security credentials, while enabling authorized remote devices to access protected content. This intermediary resolves the contradiction by mediating between security requirements and remote access needs.
Solution Approach 2:
The patent extends the DRM domain from local physical proximity to remote network access by adding a network dimension. Devices can now be authorized for remote access through credential verification and registration processes, transforming the access model from spatial-based to authentication-based, thus resolving the proximity limitation.
2Device complexity
If DRM domains are limited to a small number of devices in the same location, then security management is simplified, but device connectivity and remote access deteriorate
Solution Approach 1:
The gateway acts as a centralized security management intermediary that handles credential verification, device registration, and DRM policy enforcement. This centralizes security management at the gateway while allowing multiple devices to be authorized remotely, reducing the complexity burden on individual devices and enabling scalable device connectivity.
Solution Approach 2:
The gateway device performs multiple functions including DRM protection, credential management, device registration, and network protocol translation. This multi-functionality allows the system to support diverse devices and remote access scenarios while maintaining unified security management, resolving the contradiction between simplicity and versatility.
3Object-affected harmful factors
If proximity requirements are enforced for content sharing, then unauthorized access is prevented, but legitimate remote access by authorized users deteriorates
Solution Approach 1:
The patent changes the authorization parameter from physical proximity to authenticated identity. Instead of checking whether devices are in the same location, the system verifies security credentials and DRM rights through the gateway. This parameter change maintains unauthorized access prevention while enabling legitimate remote access by authorized users.
Solution Approach 2:
The gateway intermediary verifies device credentials and enforces DRM policies, replacing the need for proximity-based trust. This mediation allows the system to distinguish between authorized and unauthorized devices regardless of location, preventing unauthorized access while facilitating legitimate remote access.
Data Source
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AI summary
A service control method, device and system for allowing secure, remote access of protected IP-based content delivered over an IMS-based network to one or more devices within a home network. The method involves a remote access device transmitting a remote access request to a service control application in the IMS-based network, the service control application authorizing the remote access request based on a number of criteria, and forwarding the remote access request to the home network. The forwarded remote access request includes information that allows protected content requested by the remote access request to be transmitted from a home network device in the home network to the remote access device upon appropriate verification of the remote access device by the home network device using home network device DRM schemes. Remote access of the protected content can be allowed by relaxing proximity restriction requirements of the home network.