It is illegal in the UK to own a document with information likely to be useful to a terrorist. In 2012, Ruksana Begum was sentenced to one year in jail for having copies of two issues of an al-Qaida magazine on her phone; she argued that she had read the magazine to understand why her brother had decided to become a terrorist (he had been caught several months earlier). In 2016, Abubakar Abubakar was sentenced to 15 months in jail for having a magazine that contained in it instructions on how to avoid getting killed by a drone; these same instructions are available in a Buzzfeed list (translated to English). (link found on Slate Star Codex)
https://youzicha.tumblr.com/post/166323190559/documents-banned-by-section-58-of-the-terrorism
https://www.cps.gov.uk/publications/prosecution/ctd_2013.html#a06
https://www.buzzfeednews.com/article/ellievhall/22-super-easy-ways-to-avoid-getting-killed-by-drones
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