Similarly Kaspersky Labs' anti-virus software lets one copy update itself via the net and then copies on other PC can download updates from that machine via the home network.

BBC: NEWS | Technology | Home PC face security onslaught

However, the World Anti-Doping Agency are waiting for a written copy of the UK Sport decision to clear MacLeod and will determine whether it is in compliance with their code.

BBC: Beattie says Scots behind MacLeod

The pioneer drug companies like Genentech and Amgen (nasdaq: AMGN - news - people ), which makes the anti-anemia biological drug Epogen, argue that biological drugs are too complicated to copy.

FORBES: Genentech's Generic Battle