Here's an Inquirer article
on a company called SoftVault, which is suing a long list of companies for infringement of its DRM patents. If we weren't so opposed to software patents, we might be tempted to see this as a sort of poetic justice.
A look at SoftVault's web site is also instructive: "Access to software programs or digital content, or to a device, is enabled by periodic authorization messages, akin to a 'heartbeat,' exchanged between the server and client agents. As long as these periodic authorization messages continue to be exchanged, access is enabled. If for any reason the authorization messages are terminated, access is disabled. In the case of software or digital content, disabling may involve encrypting or deleting files.
In the case of a device, the disabling logic would essentially turn the device into a 'brick' that is unusable and therefore has no practical resale value."
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