This is a real situation at my previous job and I am glad that I do not have to deal with it. Around the time I was leaving my job there was a short time employee, he lasted about 6 weeks, he took files home to work on. That was not a problem and was accepted by the employer. The problem came when he tried to print the the drawings... you guessed it... he had an educational version of AutoCAD at home.
It has been 8 months since I worked there and I found out that they are still dealing with the remnants of the "corrupt" files. It is worse than a virus. I thought I cleaned the files but it looks like I missed one or someone copied info to another location before I cleaned the file. When I was leaving I told the PM's and cad operators not to reference or copy any info from that job. I told them to finish the project, remove it from the server and leave the files alone. I tried to stress the consequences but, it looks like someone copied the wrong information from the wrong place. So, now instead of it being in one job it is appearing in other jobs.
So, what would you do?