Recently, a colleague of mine recorded a SKY TV program (UK satellite company) to a hard disk (via a PC an TV tuner card), but couldn't burn the program to a DVD (attempting to reauthour the mpeg file) - with the message that the recording was copy protected. I assumed it was macrovision and loaded anydvd, and then tried to reauthor the mpeg, and it worked.
This puzzled me at first until I found that users of the standalone SKY hard disk recording system can record a file to to the hard disk even if macrovision protected albeit it is only allowed for a few days. The file cannot be copied though to the DVD recorders though.
In our similar case, the TV tuner reciording software did not check for macrovision and simply copied the file as received to the hard disk (good news as we now had a copy albeit still with macrovision). Once anydvd was installed, the macrovision was no longer an issue, and we could burn it where we liked.