Circumvention

thumb|Le grand docteur sophiste, 1886 illustration of Gargantua by [[Albert Robida, expressing mockery of his casuist education]]

A loophole is an ambiguity or inadequacy in a system, such as a law or security, which can be used to circumvent or otherwise avoid the purpose, implied or explicitly stated, of the system.

various processes to unblock censored materials on the Internet

Ḥiyal (, singular ḥīla "contortion, contrivance; device, subterfuge") is "legalistic trickery" in Islamic jurisprudence. The main purpose of ḥiyal is to avoid straightforward observance of Islamic law in difficult situations while still obeying the letter of the law. An example of hiyal is the practice of "dual purchase" ('') to avoid the prohibition of usury by making two contracts of purchase and re-purchase (at a higher price), similar to the modern futures contract. A special sub-field of ḥiyal is "oath-trickery" () dedicated to the formulation of ambiguous statements designed to be interp