The repatriation of funds realised from sale of property in India to Canada would depend on the relevant provisions relating to regulation of foreign exchange and would also require permission from the Reserve Bank of India.
Any document to an immoveable property, has to be by way of a registered document only. The same however does not per-se take away title to the property, but the same does make the title of the owner defective if his sale deed is unregistered.
Capital gains will be applicable on the transaction and the same could be Short Term Gains or Long Term Gains depending on how long you have held the property.