Computers and Buddhist monks, offering computer to monk makes bad karma to both monk and donor?
In western monasteries isn't not uncommon for monks to use computers to teach the dhamma online or write books. However, a monk wont own the computer, you'll be giving the computer to the sangha. 

You shouldn't have to worry about whether a pen or a computer is more of a distraction, the monk should be able to handle his own mind and distraction. If he knows that a computer is too distracting for himself then he will use a pen.

As for the Vinaya, you may want to search for terms "piracy" and "pornography" in Thannisaro Bhikkhu's book The Buddhist Monastic code I.

Piracy isn't against the vinaya but if a monk wanted to avoid piracy then unintentional stealing is not against the Vinaya. Accidentally seeing pornography isn't against the Vinaya but staring lustfully at a woman's parts (without intending on emitting semen) earns the lowest punishment- a dukhata.