You are generally entitled to receive a tax credit on your Canadian Income tax return for the amount of foreign withholding tax paid on amounts received from other countries. In effect CRA recognizes the foreign tax that you have paid as a reduction of your Canadian income tax liability.
"This article provides information of a general nature only. It is only current at the posting date. It is not updated and it may no longer be current. It does not provide legal advice nor can it or should it be relied upon. All tax situations are specific to their facts and will differ from the situations in the articles. If you have specific legal questions you should consult a lawyer."