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Copy protection for video is spreading to Google's mobile browser.
The software Google's browser uses to show PDF files has been proprietary for years, but now it's an open-source project called PDFium that others can scrutinize or use themselves.
Google has agreed to acquire Widevine, a firm that offers digital-rights management and distribution tools that will likely come in handy as the search engine builds out its video services.
A deal with Twentieth Century Fox Film is another step toward an Android competitor for downloads from the iTunes store.