Security software maker Certicom Corp has accepted Research In Motion’s offer to buy the company for around C$131 million ($106.5 million), or C$3 a share, after internet security firm VeriSign (NSDQ: VRSN) told the company it would not match RIM’s new offer, reports Reuters. Last week, RIM (NSDQ: RIMM) doubled its offer from C$1.50 a share, after internet security provider VeriSign stepped in with a surprise bid of C$2.10 per share, which Certicom had accepted.

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After weeks of sometimes hostile negotiations, Certicom chairman of the board Jeffrey Chisholm said in a statement today that RIM’s new deal—which represents a premium of approximately 252.9 percent over its closing price before RIM made its first offer—“is in the best interests of the Corporation.”  The security software firm took RIM to court over its first offer, alleging that the company had breached non-disclosure agreements by using confidential and proprietary information it had supplied to the Blackberry maker.

Certicom still has the right to pull out of the deal if they get a better unsolicited proposal, though they will be required to pay a C$4 million termination fee. The company said it had paid VeriSign a C$4 million to end their agreement.

More on the Certicom-RIM ordeal in our Certicom channel