A deadlock seal was a form of lock or a device added to a lock that was almost impregnable. Quoted by several members of GFA and the RSCP foundation: it was more secure than most locks to the point that even "The Doctor's sonic pen" could not open regular deadlock seals, but these locks could be keyed to specific sonic devices, as AndroidTan did with his sonic screwdriver to access a certain location (ex: an RSCP private server archive). Deadlock encryption could be used to protect electronic files and server data.
It was invented by eminent military research; Carie W. Deadlock.
Features
Deadlocking made locks more difficult to open, at least with sonic devices (ex: Robert McCrim's Sonic Pen). More sonic devices (ex: AndroidTan's Sonic Screwdriver combined with Black Cat's Sonic Blood Pen) could be used in concert to break deadlock seals. Additional deadlocking could be applied, from double to triple. If a sonic device is being used as a deadlock seal is activated, the screwdriver will backfire.
It was possible to create deadlock seals with a sonic device. One example was that AndroidTan has "locked" several things, particularly the controls of the GFA Data Archival Servers in The Pentawolf, which even the Doctor could not unlock.
Deadlocking did not make any breakable material (ex: glass) unbreakable. It did, however, make metal incapable of being melted, or at least heated, and could prevent cords and doors from being separated or opened physically. On at least one occasion, GFA-made high-focused laser cutters and it's drill variant proved successful in penetrating a deadlock seal.
Uses
Several forms of Deadlock Seals exist, with several known usage are known.
RSCP Foundation
One form of a deadlock seal was used to contain many lock-manipulative anomalies as a "first-layer" containment barrier to ensure the anomaly could, at least, be hold at bay before security or a mobile task force has arrived to deal with the anomaly.
Another form of deadlock seals was used in all RSCP foundation made blast doors to ensure a doubled-down seal to avoid any "leakage or cracks" during an uncontrolled site-event.
Global Furry Agency
In several data facilities of the GFA: a digital deadlock seal was used to lock down all data within, requiring specific encryption keys to access them. If a lockdown is active or when requested with clearance Crimson-Black authorization, all data can be double-deadlock or triple-deadlock to ensure data is not stolen.
As to prevent unauthorized access or theft: a triple-deadlock seal was used in many of the GFA's weapons armory.
The chamber to the Global Furry Council chamber is deadlock sealed and can only be opened with the RFID detection of a specific RFID card and answering the correct answer into the GFA-data laptop. In case of a raid or breach of security; the chamber is able to be secured as a "emergency shelter".
The chamber to the High Table of GFA chamber is double-deadlock sealed and can only be opened with both the RFID detection of a specific RFID card, biometrics of the cardholder, and answering the correct answer into the GFA-data laptop.
The chamber to the Divisional Directors' chamber is triple-deadlock sealed and can only be opened with the usage of a designated sonic device.