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A locked letter from 1603. Letterlocking is the act of folding and securing a written message (such as a letter) on papyrus, parchment, or paper, without requiring it to be contained in an envelope or packet.
Security printing is the field of the printing industry that deals with the printing of items such as banknotes, cheques, passports, tamper-evident labels, security tapes, product authentication, stock certificates, postage stamps, and identity cards.
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Lock-up is the final step before printing. The printer removes the cords that hold the type together, and expands the quoins with a key or lever to lock the entire complex of type, blocks, furniture, and chase (frame) into place. This creates the final forme, which the printer takes to the printing press.
A Wordlock letter combination lock.. A combination lock is a type of locking device in which a sequence of symbols, usually numbers, is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs or cams, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an ...
LockLizard Limited is a British software company that specializes in digital rights management (DRM) security for PDF documents, USB flash drives and eBooks. [1] It was founded in 2004 by Trevor Mathews to provide Document DRM software that uses encoding and encryption to protect against unauthorized copying, sharing, unlimited printing or ...