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TMZ has obtained several letters that Fishburne's legal team fired off to a porn star named Brian Pumper -- demanding that his production company immediately stop all sales of "Phattys Rhymes & Dimes 14" ... which features a scene between Montana and Brian.

According to the letters, Montana never signed a release for Brian to use the X-rated material in his video.

As for why Montana agreed to engage in coitus in front of Pumper's cameras in the first place -- Fishburne tells us Brian offered to help her "practice" for her big debut with Vivid Entertainment ... and the footage wasn't supposed to
be sold.

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