Soon it will no longer be illegal to rip CDs or DVDs for personal use.
The government is poised to announce the change as it accepts some of the recommendations of the wide-ranging Hargreaves Review of UK copyright law.
The review was intended to identify legislation that has been outdated by technological change.
As well as legalising "format shifting", it also suggested relaxing rules on parody and creating an agency to licence copyrighted content.
Business secretary Vince Cable is set to announce the official response to the Hargreaves Review at a press conference.
The government is widely expected to accept and pledge to implement many parts of the review.
'Not very good law'Millions of people regularly convert movies on DVDs and music on CDs into a format that they can move around more easily, although most do not realise that it technically illegal.
"The review pointed out that if you have a situation where 90% of your population is doing something, then it's not really a very good law," said Simon Levine, head of the intellectual property and technology group at DLA Piper.
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End Quote Susan Hall Cobbets LLPIt's about riffing off, not passing off"
Legalising non-commercial copying for private use would bring the UK into line with many other nations and also meet the "reasonable expectations" of consumers, said the government.
The change would not make it legal to make copies and then share them online.
The legal anomaly preventing personal "ripping" was one of many identified by Professor Ian Hargreaves in the review as stifling innovation.
One technology caught out by the law was the Brennan JB7 music player that lets owners copy their CDs onto a hard drive that can be accessed from around a home.
The Advertising Standards Authority demanded that Brennan advise customers that using the JB7 breaks the law.
CopycatSome legal experts believe that the acceptance of format shifting, combined with relaxations on manipulating works for the purpose of parody, paved the way for creative people to use content in different ways.
Susan Hall, a media specialist at law firm Cobbetts LLP, said the changes would give many artists "room to breathe" and remove the nervousness they might feel when using another work as inspiration.
One example that would be tolerated under the new regime is the Welsh rap song Newport State of Mind which was based on Jay Z and Alicia Keys's song Empire State of Mind.
Despite winning many fans on YouTube, the track was removed following a copyright claim by EMI. It is still available on other websites.
"There are all sorts of things that are genuine artistic works which are nevertheless based on parody, caricature and pastiche," said Ms Hall.
Updated laws on copyright could have a profound effect on the popular culture that can be created, albeit one that was hard to measure, she added.
One example is that of Doctor Who writers Russell T Davies and Steven Moffat who began their careers writing fan fiction about the time lord.
Such creative synergies could become more common in a more tolerant copyright climate, suggested Ms Hall.
"Rights holders are often very nervous about things like this but when you come down to it, it's the people that buy everything who also go to the trouble of writing and creating more," she said.
"It's about riffing off, not passing off."