Koo - Further to tada's explanation, here is a little info. on the possible immediate tax implications. To de-register the shares, CRA would consider it a tax event. That isn't a big thing if they are in a TFSA as it would be tax exempt. The future tax exemption from future gains would be lost though. Shares held in an RRSP would be worse. It would be a tax event with possible gains that tax would have to be paid in that year. You might accept the OTC price and then the gain might be low. Hopefully, CRA would also but no guarantee while PP's are being done in Canada at $1.90/ share. 

RVX was trading around $3.00 prior to the spin out. For persons buying other than TFSA @ $3.00, their ABC would only be $0.27. If CRA demanded the value to be $1.90, the gain would be $1.63/share. With what some have stated on here about holdings, that might be an current year $12,000 tax bill. Some people might have bought at $10.00/share. If so, the ACB would be $0.91. If a $1.90 had to be used as the transfer price, the gain would be $0.99 and could be a $7000 current year tax bill. 

There is no way to know what CRA would accept as we would no longer be dealing with a public company trading in the US. What you think is fair, they might not see the same way. The tax implications might be less than I have stated but they might also be as I have stated. It gives a little illustration of what the implications might be.

Actually, the tax implications would be even worse than I have stated in an RSP as you have already used up your ACB so the ACB would be zero and the whole transfer price would be taxable.