Viral ad video "Girls" by American toys startup GoldieBlox has got into a serious copy infringement dispute. The video that encourages girls to pursue careers in engineering and technology fields has instigated a legal battle between GoldieBlox and Beastie Boys. The video which went viral since it was posted is based on the 1987 song "Girls" by Beastie Boys and has now become a hot topic of discussion for various reasons. And Beastie Boys has recently written an open letter to the toy company to share their thoughts over the dispute.

The toy company has filed a lawsuit that claims that the American rap band has threatened to sue them under copyright infringement law.

"The Beastie Boys have now threatened GoldieBlox with copyright infringement. Lawyers for the Beastie Boys claim that the GoldieBlox Girls Parody Video is a copyright infringement, is not a fair use and that GoldieBlox's unauthorized use of the Beastie Boys intellectual property is a "big problem" that has a "very significant impact," reads the lawsuit that was filed on Thursday by GoldieBlox.

Following which the American toys company GoldieBlox that aims to sell technology based toys for girls has approached California Federal court demanding "declaratory relief" in the said legal dispute. They claim that the ad features a satirical version of its original version. GoldieBlox has put up a strong fight against for the viral video ad released by them in the light of copy infringement dispute.

It is reported, that after the death of Adam Yaunch late band member of Beastie Boys, the group had prohibited the use of their music in any ads. Earlier on, the band has sued Monster Energy Drink's company for the use of their music in their ads without seeking their permission.

And now, Beastie Boys band members decided to write an open letter to American toy startup to clarify their perspective on their use of band's music.

The Open Letter reads:

"Like many of the millions of people who have seen your toy commercial "GoldieBlox, Rube Goldberg & the Beastie Boys," we were very impressed by the creativity and the message behind your ad.

We strongly support empowering young girls, breaking down gender stereotypes and igniting a passion for technology and engineering.

As creative as it is, make no mistake, your video is an advertisement that is designed to sell a product, and long ago, we made a conscious decision not to permit our music and/or name to be used in product ads. When we tried to simply ask how and why our song "Girls" had been used in your ad without our permission, YOU sued US."

Though, the spokesperson of American toy company GloldieBlox hasn't responded to the open letter yet, Beastie Boys' representative added to the open letter written by the boys in regard to the dispute over viral ad video "Girls" and said: "There was no complaint filed, no demand letter -- no demand, for that matter -- when they sued Beastie Boys."

Related Articles: Watch Viral Video: GoldieBlox's Ad Version of Beastie Boys' 'Girls'-- Encourages Girls to Pursue Engineering; Instigates Legal Dispute