LOS ANGELES (CBS/AP) — YouTube will soon give viewers the option of paying a monthly fee to skip ads.

On Wednesday, the online video service sent a letter to its most-popular content creators asking them to sign off on new contract terms to allow for the change.

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It’s not clear when the option will be offered or how much the fee will be.

A YouTube spokeswoman declined to confirm specifics but said in a statement, “giving fans more choice to enjoy the content they love and creators more opportunity to earn revenue are always amongst our top priorities.”

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The streaming video service owned by Google Inc. first offered pay channels in May 2013 and also launched a paid subscription, ad-free music service called Music Key to select participants in November.

The moves are all part of a strategy to diversify its revenues, although advertising remains its core. At a media conference in October, YouTube CEO Susan Wojcicki said ad-free subscriptions represent an “interesting model” and that the service was exploring how to give its users options.

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