Holiday makers heading to Europe could lose access to their Netflix and Spotify accounts whilst travelling under a no-deal Brexit.
Watching sports online, video games and even listening to e-books you downloaded for your holiday might banned, technical papers have warned.
Websites and cloud storage based in the European Union could also be blocked or have limited availability for British citizens, if EU laws are removed when the UK leaves in March next year (2019).
Currently, under the "portability regulation" agreed by the Union last year (2017) EU citizens can access entertainment accounts set up or based in one county while visiting other member states.
This allows Brits to use accounts for popular apps like Netflix and Spotify abroad, and continental citizens to access services like the French CanalPlay and MyTF1, while on holiday or a business trip, with firms using various data to analyse users' home nations.
Travellers would no longer be able to keep up-to-date with popular Netflix series including The Crown, Stranger Things, The Good Place and Making A Murderer, or their favourite music while abroad.
When it was announced by the EU it said it would cover "films, sports events, e-books, video games or music services."
But a paper on copyright warns that this regulation would disappear for Britons in a no-deal scenario.
"The portability regulation will cease to apply to UK nationals when they travel to the EU," it warned.
"This means online content service providers will not be required or able to offer cross-border access to UK consumers under the EU Regulation.
"UK consumers may see restrictions to their online content services when they temporarily visit the EU."
A second technical paper warns that no-deal would strip away the EU Geo-Blocking Regulation that takes effect in December.
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The law will prohibit businesses and traders from discriminating against citizens purchasing goods and services online based on their nationality or place of residence in the EU, Birmingham Live reported.
"Following repeal of the Geo-Blocking Regulation in the UK, traders from the UK, EU and third countries would not be prohibited from discriminating between EU customers and UK customers," it said.
The regulation deals with purchases such as those of goods online and electronically supplied services such as web hosting or cloud storage.
UK traders wishing to operate within the EU would still have to abide by the regulations, however.
"The Geo-Blocking Regulation will continue to operate in the EU. UK traders who wish to continue operating in the EU will continue to be bound by the provisions of the Geo-Blocking Regulation when dealing with EU customers," the notice said.
"This means that a UK trader will not be able to discriminate between customers in different EU member states, for instance between a French and a German customer."