PSSH, or the Primordial Soup of Secure Headers
summary
A deep dive into PSSH (Protection System Specific Header) boxes used to identify encryption keys in DRM, examining concrete examples from multiple DRM schemes. The talk analyzes varied payload encodings — including little-endian UTF-16 XML, protocol buffers, and base64-encoded JSON — and traces PSSH’s historical evolution and how different providers’ implementations and design choices influenced one another.
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