The BBC Trust will not investigate the BBC for enabling Shockwave Flash (SWF) Verification on its iPlayer catch-up TV service.

It was revealed last week the BBC enabled SWF verification on February 18, which resulted in web users with 'unathorised' open-source software, such as Xbox Media Center (XBMC), being unable to view content on the service.

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Finland-based tech site AfterDawn said Adobe's SWF verification has "made it impossible for developers to create a fully-compatible open source Real-Time Messaging Protocol (RTMP) client".

"RTMP is used by Flash for streaming video, and it is publicly documented, but Adobe has guarded the RTMP content protection measures. SWF Verification is a security measure that can lock out an unauthorised client from multimedia content," said James 'Dela' Delahunty said.

Delahunty said SWF Verification is designed to guard against piracy, which in the case of iPlayer is ripping videos. However "regular honest users are once again caught in the crossfire".

The BBC Trust told The Register: "The decision to block open source plugins is a matter for BBC Management.

"The Trust has not received any complaints on this issue and has no plans to look into it further at present."