I think you are more likely to see the sentence in the form of "will be subject to", "has been subject to", "has been subjected to" or "is subject to". It would be used in a context such as: "This contract will be subject to change." Which means that the contract will certainly be changed sometime in the future. "is subject to" basically means to be prone to something, or likely to experience something. sub·ject (sbjkt) adj. 1. Being in a position or in circumstances that place one under the power or authority of another or others: subject to the law. 2. Prone; disposed: a child who is subject to colds. 3. Likely to incur or receive; exposed: a directive subject to misinterpretation. 4. Contingent or dependent: a vacation subject to changing weather So in instance 2 it says, "A Child who is subject to colds." This means that "a child who is prone to catching colds." (prone = having a tendency towards) Hope this was in someway helpful as I am not sure I explained myself properly.

allow me to make an example: if you are selling a product to a foreign customer, but when they ask the price. you might say: the rough price is around --usd, but,you know,cuz the price of raw material is changable, so, the final price would be subject to our final confirm. in other words, be subject to sth means sth is the last say.

If you park in an illegal space your car may Be Subject to be towed at owners' expense.