Software developers said Wednesday they have "jailbreaked" the BlackBerry PlayBook tablet.

Jailbreaking refers to altering operating software to allow unauthorized access to systems or the running of unapproved programs.

The developers, - who called themselves xpvqs, neuralic and Chris Wade - showed in a YouTube video a PlayBook tablet used to stream a television show from online service Hulu, which is not available on the RIM tablets. Another video showed typing commands into a computer to turn the PlayBook's LED indicators on and off.

The developers plan to release the PlayBook jailbreaking tool called DingleBerry next week.

RIM is investigating this claim and have been in contact with one of the security researchers to discuss it.

PlayBook tablets run on a QNX operating system that is different from the software that powers BlackBerry smartphones, meaning that the Blackberry smartphones should not be affected by the hack.