XOR is the best DRM. Since all DRM is breakable since you need the decryption key to play the content, the purpose should be to trigger the copy-protection-prot

XOR is the best DRM. Since all DRM is breakable since you need the decryption key to play the content, the purpose should be to trigger the copy-protection-protection stuff in the DMCA, and XOR is the simplest way to do that.