Abstract: A method of DRM protection for an image or a series of images or a succession of video frames, comprises: generating a reversible transform; applying the reversible transform to a source image; compressing the transformed image into a bitstream; and supplying the bitstream to a recipient for consumption. At the recipient the bitstream is decompressed and sent to the image display hardware with the transform still in place. A key is used to generate the inverse transform at the recipient and the inverse transform is then carried out in the image display hardware. An additional transform may be applied to the image following the inverse transform to offset pixels from an average value. Thus the source image itself is never exposed at the recipient although the image can be correctly viewed.

Abstract: A method of verifying, controlling and limiting distribution of digital artwork files, comprises designating a trusted third party registration server; receiving a digital artwork; registering the received artwork at the registration server; defining an allowed number of copies of the registered artwork, the allowed number being at least one; creating individual copies of the artwork up to the allowed number; at the registration server assigning an individual copy to a user; supplying the user with a file comprising an electronically watermarked version of the individual copy; allowing the user to relinquish the individual copy; upon relinquishing, making the individual copy available to a second user by repeating the supplying stage.

Abstract: A method of DRM protection for an image or a series of images or a succession of video frames, comprises: generating a reversible transform; applying the reversible transform to a source image; compressing the transformed image into a bitstream; and supplying the bitstream to a recipient for consumption. At the recipient the bitstream is decompressed and sent to the image display hardware with the transform still in place. A key is used to generate the inverse transform at the recipient and the inverse transform is then carried out in the image display hardware. An additional transform may be applied to the image following the inverse transform to offset pixels from an average value. Thus the source image itself is never exposed at the recipient although the image can be correctly viewed.