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Copy protection for video is spreading to Google's mobile browser.
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.
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.
A deal with Twentieth Century Fox Film is another step toward an Android competitor for downloads from the iTunes store.