I've no idea how I might have infringed copyright, but the matter is moot now.
I couldn't unpack the rar file mentioned, so I got the code from alarmremote. Helpful fellow called Dave patiently guided me through the code aquisition process, a process made more complicated by the fact that the key I've got is unusual for a '96/97 Laguna, and what looked like a z was in fact a 2.
Here is a what I had to do to de-immobilse my car.
1. Find car numbers (on a sticker in the engine compartment and on a sticker in the driver's doorwell on my car. This was one long series of numbers and letters.)
2. Find key number. (Open the key fob, then ignore the 4-figure number and look for a yellow sticker or a franked stamp of 8 digits/letters, followed by an = sign and three numbers). *I was very careful about not separating the battery from the connector in the fob (plip) for more than 15 seconds.
3. Phone alarmremote, tell them the numbers, pay £10, get 4-figure code.
4. Insert key in ignition and turn so that dashboard lights are on.
5. hold down the central locking button near the handbrake. The rapid flashing red light will go out, then start to flash slowly. Each flash represents one numeral of the first number of the code. When the required number of flashes has been reached, let go of the button.
6. Repeat (5) for the other three numbers of the code.
7. Wait a few seconds (I waited 30 secs) while the red light goes off, then stays on.
8. Start the engine (I did this without returning the key to the off position or removing the key). The red light goes out.
9. Drive away with a podgier wallet than your mechanic would have hoped for.
*It's worth noting that two local Renault dealers quoted £50 and £80. One said that specialist equipment was needed. Another said a new key would be required. The local garage (usually good) thought that I needed a new
. They looked genuinely suprised to see me drive off!
Thanks to Renaultforums and those who posted. Immobilsers are a new hell for me and I was dreading a large bill.