Yes,, probably. If you are using the sames keys on several PC's this is considered abuse and would be blacklisted and your MSDN account blocked/banned. If the MSDN account is not yours and you got the key somewhere else, expect that that key will become blacklisted in the near future anyway. If you got it from a friend, it is possible that their account could also be banned.
If you do move the key to a new PC and activate that one and not using it on any other PC, this, as far as I know, is acceptable. They are kinda like, i think, retail keys.
You can use them only on one PC at a time.
Keep in mind that MSDN (Technet) keys are for evaluation of the product only and are not supposed to be used on a primary used PC.
Also,, the others are correct,, you get 10 separate keys for one PC each. That's it.