Hackers use software that throws millions of these at password forms to try to unlock accounts - a technique known as dictionary attacks.

In theory, internet users in Europe could circumvent the restrictions by using software that hides where their computer is based.

Its software is used to process images captured by drone aircraft to identify movement in areas of the world being monitored by intelligence experts.

Others lack the confidence to use the software.

A pressure-correction based, multiblock, multigrid, unstructured/adaptive commercial software was used in this investigation.