Titan's vudu spell: Walmart wades into streaming film.

Walmart, the biggest seller of DVDs in the country, is making sure it's not left behind as more consumers rent or buy movies digitally.

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The retail giant announced Monday that it has acquired streaming video service Vudu for an undisclosed price.

Vudu, a Santa Clara, Calif.-based venture that launched three years ago as a maker of set-top boxes that enabled paying subscribers to download movies using an Internet connection, has since evolved into integrating its software directly into Web-connected TVs and Blu-ray players.

Nearly all the TVs and Blu-ray players set to hit the market over the next year will include Internet …