Farrah Abraham Warned: Shut Your Yap About Vivid in "Celebrity Sex Tape" Book!

Farrah Abraham's upcoming "erotic novel" about the sex tape industry reportedly has executives at Vivid Entertainment concerned about what she might reveal.

Having previously ordered her to stop blabbing about how she was drugged and raped while promoting her porn debut, they've fired off another legal threat here.

Farrah Abraham Warned By Vivid

Demanding that she keep her trap shut about how the industry courts and signs "talent," Vivid CEO Steve Hirsch believes his trade secrets are worth millions.

Only if they remain that way, though: As in secrets.

Farrah's "Celebrity Sex Tape" book trilogy is loosely based on her experience in the porn business, which gave Vivid a smash hit in Backdoor Teen Mom.

Hirsch doesn't want the details to get out regarding how the controversial film, which co-starred industry regular James Deen, came to be last year.

It was marketed as a sex tape, as we know, but ...

Clearly it was planned out ahead of time, and Hirsch would just as soon make sure the public doesn't know the nitty gritty behind the disgusting best-seller.

While it's not clear what details he's worried about specifically, Farrah is both a loose cannon and notorious liar, which has to give him some gray hairs.

The CEO notes that Farrah Abraham signed a confidentiality agreement and that extends to thinly-veiled fiction ... whatever juicy tidbits it might contain.

The book isn't even out yet, so stay tuned.