Hi Andrew, here at Parks Canada we have several guided tour aps in our National Parks and we use the "Sure Lock" on ours to lock everything on the tablets we loan to visitors except the English and French versions of the our ap. It is free and works well. When you install sure lock it will ask you to set up a password. You will use this password to disable the ap when you want to update your device. You hit your screen 5 times and type in this password to exit sure lock and access your device as usual. Hope that helps. Thank You | Merci Sara Wilson Interpretation Product Development Officer | Agent de développement de produits d'interprétation Visitor Experience Branch | Direction de l'expérience du visiteur Parks Canada | Parcs Canada 30 Victoria Street, 2nd Floor, suite 18 | 30 rue Victoria, étage 2, pièce 18 (PC-02-E) Gatineau, QC J8X 0B3 [log in to unmask] Telephone | Téléphone 819-420-9308 Facsimilie | Télécopieur 819-420-9332 www.parkscanada.gc.ca | www.parcscanada.gc.ca Government of Canada | Gouvernement du Canada Conserve, Restore and Connect with Nature | Conserver, restaurer et se rapprocher de la nature **************************************************************** website: http://museumscomputergroup.org.uk/ Twitter: http://www.twitter.com/ukmcg Facebook: http://www.facebook.com/museumscomputergroup [un]subscribe: http://museumscomputergroup.org.uk/email-list/ ****************************************************************